The gas boiler does not heat hot water. Why? Cause? Double-circuit boiler Baxi (baxi), this is an analogue of Navien and Ariston

Reading time: 2 min

Gas boilers are designed to create comfortable conditions existence. Double-circuit units provide living space with heat and hot water in the tap. But it happens that a working boiler does not heat the water well and does not provide the necessary comfort.

The efficiency of the entire heating system depends on how the boiler operates. If there is a problem in the gas boiler itself, this can negatively affect the efficiency of the entire system and cause excessive consumption of energy resources.

What happens when the boiler stops heating water? Let's look at the reasons and ways to solve this problem.

How does a boiler work?

To understand the situation more clearly, you need to understand the principle of operation of the boiler. Such double-circuit gas wall-mounted boilers, like “Baksi” or “Ariston” consist of several components. In the gas part, the incoming fuel is burned, the water part ensures the supply of heated water from the heat exchangers to the heating system, and the smoke removal part is responsible for removing combustion products outside the home.

After starting the boiler, the pump is turned on to ensure the required water level in the system and the gas supply valve opens. The coolant moves in a heat exchanger, which is heated by a burner flame. The thermostat is monitored temperature conditions in the room, temperature sensors monitor readings on the supply and return pipelines. Indicators of fuel pressure, coolant in the circuits, the presence of draft and combustion are also taken.

Depending on user settings temperature sensors set the water heating mode. A sensor on the return pipeline turns off the boiler, depending on the achievement of the required temperature set for the return. However, the system pump does not stop running until the heat exchanger temperature drops.

This is provided to prevent the water from boiling in it. As soon as the coolant cools down to the maximum level, the electronics will send a signal to turn on water pumping and the gas valve. The whole process will start again.
When you open the tap in the mixer in a double-circuit boiler, a flow sensor reacts, which informs the electronics about the need to switch three directional valve to water heating mode for DHW.

When the hot water tap is turned off, it returns to heating mode. Some manufacturers provide heating for both heat exchangers during periodic switching.

The boiler does not heat water for heating

So, let's look at the main reasons why a gas boiler does not heat water for the heating system and what to do about it:

airlock. It is necessary to inspect the heating system for the presence of air in the radiators. To eliminate this problem, you need to install an air vent. The principle of its operation is similar to the work expansion tank, however, it is able to maintain pressure in the system. Using an air vent, you need to bleed air from the system. It is important to inspect the valve itself for mechanical blockage– there may be scale present there;
corrosion in radiators. Clogging of heating devices can be determined by draining water from the system. If the water flows dirty, then it is necessary until visually clean water appears;
connection errors. Hot water may not flow if the diameter of the pipes is not as specified in the project or instructions. It is necessary to check the suitability of the pipeline, correct connection and quality of installation shut-off valves;
insufficient pressure in the network. You should try adding water to the heating system, as there may not be enough pressure to trigger the automatic ignition of the burner;
presence of scale in the heat exchanger. The first sign is prolonged heating of the coolant and heating of the batteries. It is necessary to get rid of sediments and carry out boiler water treatment. To do this, you need to disassemble the boiler and remove the heat exchanger assembly.

Before doing this, you need to shut off the flow of gas and water to the device. Then flexible connectors from the pump are connected to the heat exchanger and it is washed with a composition containing a special cleaning agent, which can be purchased over the counter. After which the parts are washed with water.

It is important to understand that adding chemical reagents in the coolant prevents and reduces the appearance of deposits on parts. But before using reagents, you need to read the boiler instructions, since some manufacturers, such as Ariston, Electrolux, Buderus, Navien or Arderia, do not provide for the use of chemical additives in the coolant. In this case, you can use water purification filters or distilled water.

Some manufacturers allow the use of antifreeze instead of water in the heating system. This substance can be used in the following boilers: “Baxi”, “Vaillant”, “Proterm”, “Beretta”, “Korea Star”. However, it should be understood that each manufacturer recommends using its own antifreeze;

filter clogging. If the filter screens are clogged with mechanical debris, the radiators may also have poor heating. Therefore, the filter should be checked and cleaned regularly by rinsing with water. If clogging occurs too often, then such a part must be replaced;
incorrect setting. First of all, if there is weak or no heating, you need to check the settings of the control unit. The temperature may be set insufficiently and the gas does not heat the water;
malfunctions pumping equipment. If the pump power is not enough to ensure good circulation, it may turn off if it overheats. This can happen when the DHW circuit is turned on;
incorrectly selected heating devices. If the system has radiators with unsuitable heat transfer and design parameters, this can also lead to low heating;
incorrect slope of pipelines. Most often this problem occurs in systems with natural circulation. Normative documents determines that the slope of the pipes should be 10 mm per meter of pipe. If these requirements are not met, circulation may be disrupted and, as a result, there may be no heating due to low coolant flow.

The boiler does not heat water for hot water supply

In addition to the lack of heating of the heating system, it happens that the gas boiler does not heat the hot water supply circuit.

The most common cause of this negative phenomenon is critical scale formation in the heat exchanger.

After all, scale has a structure that limits the passage of coolant and also takes away its heat. This is due to the thermal conductivity of salt deposits - it is much lower than the thermal conductivity of the metal from which the heat exchanger is made. That's why the boiler doesn't heat well hot water.

It is also possible that a piece has come away from the salt deposit, blocking the flow completely, which leads to a complete stop in the supply of hot water.

The next reason that the boiler does not heat water is a malfunction of the flow sensor.

Structurally, the sensor is a paddle device through which water flows, which is the condition for its operation, because it sends a signal about the presence of a flow to the electronics, which, in turn, starts heating the water again. It happens that the sensor gets clogged, but it can be cleared of the blockage without removing it.

The device has the shape of a cylinder and is located near the circulation pump. To start cleaning, open and close the tap near the sensor. If this does not help, then it should be unfastened and removed, cleaned by hand and reinstalled. If this does not help, then the sensor is most likely faulty and needs to be replaced.

The reason for the lack of water in DHW circuit A faulty three-way valve could be the cause.

It is designed to shut off the heating system when the hot water tap on the mixer is opened. If the valve does not work, the boiler does not switch to heating water for DHW from heating water for heating. The first reason for its failure may be clogging with corrosion products, which needs to be removed.

If this does not help, the valve should be replaced. The hose system and filter may also become dirty. This problem is barely noticeable on the heating circuit, but on the hot water supply circuit it will be more noticeable. These elements need to be cleaned.

Individual heating and hot water supply have long ceased to be something unusual. This is convenient and practical, and also allows you not to depend on the whims of utility services. Well, if some trouble suddenly happens, for example, it turns out that the boiler does not heat the water, then you will have to fix the breakdown on your own.

No, this does not mean that you should arm yourself with a tool and start repairing yourself - for this there are specialized companies that provide such services. If the heating boiler is working properly, but does not heat the water, then specialists will repair it, adjust the boiler according to your wishes, and, if necessary, flush the heating system. All work will be done efficiently and guaranteed.

Modern gas boilers– reliable and powerful heating devices that also perform the function of heating water. They successfully combine seemingly incompatible things - unsurpassed efficiency and compact size. But their uninterrupted operation is only possible if they are regularly Maintenance, detecting and eliminating the slightest faults.

Malfunctions of heating boilers

Basically, major faults begin to appear during heating season when two boiler circuits are operating - heating and water heating. It may happen that it does not start at all, or does not heat well enough. With the launch, the issue will have to be resolved separately, but if the water does not heat up enough, then the reason may be a clogged heat exchanger. As you know, the water quality in our systems is far from ideal, and few users install mechanical cleaning filters in front of the boiler. This is where the heat exchanger becomes clogged, resulting in poor boiler performance.

Here are the most common malfunctions of gas boilers when they do not heat the water well:

periodically switches off spontaneously,
smokes a lot,
does not develop enough power,
makes noise
clogged,
the pump is broken.

If it happens that the gas boiler does not heat the water, then often the reason is the formation on the walls of the heat exchanger limescale, which, as it accumulates, becomes very durable and not only reduces the temperature of the water, but also reduces throughput boiler The thermal conductivity of scale is tens of times less than that of metal, so it is not surprising that the boiler does not heat the water. If you don't take any preventive measures, then very soon you will have to completely disassemble the boiler and remove deposits mechanically.

This problem can only be helped by timely washing of the heat exchangers, and this should be done regularly, especially if cleaning and softening filters are not installed in front of the boiler. For washing, special chemicals, but they should be used with great caution, since they are equally destructive to lime deposits and to the material from which the heat exchanger is made. It is best to invite a specialist for this purpose.

For safe and efficient work It is recommended to carry out preventive maintenance on a gas boiler. It is advisable to do this regularly before the start of the heating season; you should not wait for a situation when the boiler does not heat the water. This approach will ensure the duration of its service and economical operation. Major renovation carried out as necessary by a service center employee - it is strictly prohibited to do this yourself.

One of the problems that can happen when using a double-circuit boiler. The boiler does not heat hot water. The main and most common reason why the boiler does not heat water well is that the heat exchanger is clogged.

In this article I will describe how I treat this problem. This way you can also get out of the situation if you have a double boiler with a plate heat exchanger.

My house has a well and the water is very hard, so I constantly have problems with hot water. To remedy the situation, I use citric acid.

This is the task. Like with with the least effort deliver this acid to the inside of the heat exchanger.

I found this way. At the entrance to the boiler I have a magnetic converter, which is supposed to remove water hardness, but it does not remove it, in my opinion this is a fiction. But the good thing for me is that it is installed right at the entrance to the boiler. You can see it in the photo below.

There is an American nut on it; after unscrewing it, you can easily pour citric acid into the inside of the pipe.

But to do this you need to turn off the water. I have a collector next to the boiler. He is in the photo below.

Now all the channels on it are open and with one easy movement I turn off the water supply to the boiler.

All water is shut off, now you can unscrew the American connection on the magnetic filter. And don’t forget to come up with something from flowing water from the boiler, there is not a lot of it, but it is there. I wrapped up the rag.

Then I pour citric acid into the inside of the pipe.

I screw the American valve back and open the supply valve tap water into the boiler.

Now it is important to understand when the acid will enter the heat exchanger. Since my water tap is located a meter from the boiler, I determine whether the acid has reached the heat exchanger to taste. I just open the tap in short jerks and taste how “sour” it has gone, which means the entire system from the magnetic filter to the tap is full citric acid.

Next, you need to turn off the tap so that your household does not drain all the acid ahead of time.

I charge the system at night and it stays acidic until the morning. In the morning I open the water supply tap to the boiler and drain all the acid. The water will hiss, don’t be alarmed.

The question may arise, will the acid eat away at the heat exchanger? I did some digging on the chemists' forum and came to the conclusion that organic acid (citric acid) is harmless to copper.

I use this method when necessary. If you don’t like how the boiler heats the water or the pressure of hot water has become weak, I take the heat exchanger and treat it with citric acid.

If you have connections to the boiler made of polypropylene, and there is no place to put the acid, then come up with something similar; it won’t take much time.

Questions about Arderia boiler malfunctions

Question: On my Arderia esr 2.13 ffcd gas double-circuit boiler, the display shows error AA (water boiling). You set the temperature, it adjusts it as usual, and then as soon as it drops a few degrees, it turns on, and so on ad infinitum. It turns out that it turns on every 10 seconds. The pump is working, the filter is cleaned, all taps are open, the sensor is working. Most likely the problem is with the 3-way valve. Tell me what
do?

Answer: You need to call a specialist to reconfigure the boiler, namely, Arderia has service menu which you can go to from the control panel, there you need to increase the setting of the difference between the set temperature and the start temperature.

Question: After 2 years of normal operation, the following things began to happen: when the heating is turned on, during heating, a sharp increase in pressure occurs (according to the indications of the dial “pressure gauge”) and an emergency discharge of the coolant. What is the problem?

Answer: Most likely - damage to the expansion tank membrane or lack of air (nitrogen) in air chamber(unless, of course, there is a shut-off valve on the tank that “accidentally” closed. It is also possible that the three-way valve is faulty.

Question: We installed and connected a gas wall-mounted boiler Arderia 2.13, which served without complaints for exactly 2 years and malfunctions began. The heating works fine. But the hot water does not want to heat up. The burner goes out, then lights up again and the water comes out barely warm or even cold. And when you open the tap, the batteries suddenly start to heat up. Who has encountered this, tell me what it could mean?

Answer: If barely warm water flows, that means the three-way valve is switching. As an option, a 2nd heat exchanger on the heating side. That is, if the heating boiler operates stably and reaches its nominal value, then no. If the hot water pressure is ok, it may be clogged secondary heat exchanger through the heating channel. At the request of the DHW, the boiler lights up and goes to nominal, but the heat is not removed, so the boiler extinguishes the burner. Another option is a sensor DHW temperature lies.

Question: We installed and connected the wall-mounted boiler Arderia esr 2.13 ffcd. Worked for 4 years. Recently everything turned off. Right down to the backlighting of the remote control. It does not go into emergency mode. I removed the board, pulled it out of the casing, there are 2 fuses. But they are intact. What happened and how to save yourself? There is a complete feeling that the power has simply disappeared. Power supply through stabilizer. The stabilizer is working.

Answer: Change the board, set the DIPs on the new board to the same as on the old one.

Question: We installed and started up a gas double-circuit boiler arderia esr 2.20. I have a question about its operating mode. The boiler operates practically without stopping the pump, while the coolant temperature drops to a set value after the burner is turned off, and the burner fires again. And so on almost without pause. I didn't notice this before. It was also noticed that when you turn on the hot water supply, very hot water first comes out of the tap; you cannot put your hands on it. Is this a malfunction and how to increase the pause time.

I also wanted to ask about this moment. I tried to regulate the operation of the boiler according to the room temperature.

Boiler doesn't heat water? There is only one reason - scale

I set it to 27 degrees (lower is not comfortable), boiler long time it works, the coolant heats up to the maximum (80 degrees C), then when it gets hot it turns off.

He may even “fall asleep” for a long time (for half a day or more), although the rooms are already getting cool and it wouldn’t hurt to turn on, but I look at the remote control - the temperature shows 27, although there is a feeling that it has dropped significantly lower. Either the sensitivity of the remote control is very uncomfortable + -1
degree, or is this some kind of malfunction. Who can say anything on this issue. The boiler has been in operation for 2 years.

Answer: I can assume that the remote control is poorly positioned; there is no air circulation around it.

Question: I don’t like the operating mode of the Arderia esr 2.20 ffcd gas boiler when regulated by coolant temperature. I will describe the operating mode in more detail: Let’s say the coolant temperature has dropped to the lower limit at which the gas supply is triggered and heating occurs
coolant.

Moreover, heating occurs within no more than half a minute, while the pump continues to circulate water. Over the next half a minute, during the circulation of the coolant, it cools down again to the lower limit and heating is turned on again, and so on with virtually no pauses. I haven’t changed the settings (factory settings) and I don’t know how to do it.

The only thing I checked was the parameters given in the manual, they are the same. I had not noticed this mode of operation before, because it was the other way around: at first certain time after the boiler was activated, the coolant circulated without heating, then the heating was turned on, the pump continued circulation for a certain time, then turned off and there was a pause in its operation, now this pause simply does not exist.

Sometimes during the day, in order not to load the boiler, I turn on the timer mode (but the minimum value there is one hour). I would like to hear your opinion on how the boiler works and how to put it in order?

Answer: The other day there was an error A8, the boiler was puffing like a steam locomotive, the burner ignited and went out after 30 seconds. This happened after heating the water in the heating system and flushing the heating circuit in the boiler. The problems have disappeared. I recommend that you also start cleaning the boiler.

Question: We installed and started up the Arderia 2.20 boiler. The hot water supply is either cold or hot, the gas is not cut off at this time. After 20-25 minutes it is constantly hot. Another thing is that the water becomes at a comfortable temperature (not cold) only with a small pressure at one point; if you open hot water in another place, the boiler may go out. I read the instructions, I'm inclined to think that it needs to be washed DHW heat exchanger. Can you tell me anything else?

Answer: Maybe your heating system is airy, and while air and water are circulating through the circuit through the heating heat exchanger, the water temperature is unstable. I think you can check this by turning off the boiler for half an hour and turning on the heating and listening to the sound of bubbling in the boiler; if it is bubbling, then the air is bubbling, if not, then probably the three-way valve.

If this is the diagram of your boiler, then there is a high probability that the three-way valve is faulty
because it stands at the outlet of the heat exchanger and very hot coolant comes out through it and destroys the 3-way valve. On most boilers, the 3-way is located on the heating return and operates at a lower temperature.

Question: A wall-mounted boiler Arderia 2.20 is installed and connected in the house. The problem is that it doesn't heat hot water. when you open the mixer it goes cold water, this happens both in summer and in winter mode. When the mountains open water, the flame turns on and it heats the heating circuit. At first I thought it was a three-way valve, so I bought a new one and installed it. But the problem was not solved, everything remained the same. Tell me what to do?

Answer: Scheme: The hot water tap was opened - flow began - the DHW flow sensor was triggered - a signal was received on the control board - the control board processed the signal and sent a command to the three-way valve - the three-way valve worked and redirected heating water V plate heat exchanger— the heating of the cold household began. water in the secondary plate heat exchanger - mountains came out of the water tap. household water.

What is the weak link in this algorithm? DHW sensor - board - three-way valve. Let's start in order with the sensor. The sensor may simply not work due to the fact that the pressure that creates the water flow is weak or there is increased hydraulic resistance, i.e. the filter is clogged or there is dirt in the sensor itself. A clogged secondary also creates increased hydraulic resistance, but in this case, heating of the hot water supply would most likely occur in pulsation mode, and would not be absent at all, especially not at all.

Question: We installed and commissioned the Arderia ESR 2.35 FFCD gas boiler. There is a decent pop when igniting. Cleaned and inspected gas valve, pipe, electrodes, etc. I played with the min. pressure on the valve, did more and less than the factory one. It still slams, although a little less. When you pull the wires off the modulating coil, the turbine gradually begins to spin up to high speeds (from observation).

With the modulating coil wires removed, the boiler ignites more smoothly. How can I make it work at minimum without disconnecting the modulating coil? How to reduce the starting voltage on the coil? Reduce the starting voltage on the coil - Switch 5 on the board - to the lower position. Then use the “MIN” resistor on the board to reduce the pressure. Then return switch 5 to its place.

Answer: When adding gas, the boiler adds air. The power was removed, the flame decreased, the temperature dropped, he adds voltage to the modulation coil and increases the fan speed. Just in case: there is a screw under the modulation coil. It allows you to change the min. gas pressure without changing fan speed. But act wisely, because it will be difficult to return it back.

Question: I have the same problem with the Arderia double-circuit boiler. The hot water supply is constantly at 40 degrees, now summer is warming up, probably 70-75 degrees, I can’t say for sure! I called the foreman, unfortunately, we live in the regional center far from service centers! He told me that either the cold water pressure is weak or it is warmer in the summer season and therefore the water overheats! He says to turn down the gas supply on the board or on the valve, in my opinion tighten the nut, no use! You turn off the water, and it still hums for 1-2 minutes! Maybe something can be done to stop the water from heating up so much?

Answer: You need to check the burner setting; if it’s normal, then simply open the water tap harder.

Question: We installed an Arderia esr 2.13 ffcd boiler. It seems to be crammed with automation, but gas workers are forcing us to install an SCP with 2 sensors for CH4 and CO. I still agree to methane, but I don’t want to throw money away for the second one. Yes, and SNiP echoes the same thing to me. But they are of no use. I want to prove that the boiler has a reverse draft sensor (also known as a carbon monoxide concentration sensor), but I can’t find documentary evidence anywhere. Although he is definitely there. If there is a notorious reverse draft sensor. Show me where it is in the boiler?

Answer: The role of a draft sensor is performed by an air pressure switch. Located inside the device. Turns off the boiler when clogged pipes chimney or air supply. Or it will not allow it to turn on during these problems. The draft breaker is just one of the elements of the boiler; in fact, the reverse draft sensor is located on it (if we talk about boilers with an open combustion chamber). And if the flue gas leak does not occur at the place where this sensor is installed (this could be a leak in the chimney after the boiler or through leaks in the combustion chamber), then this sensor will not react in any way.

Question: The Arderia dsr 220r boiler has been in operation for about a year. About a month ago, problems with the hot water supply started (when hot water is turned on, the AA error light comes on), I checked the electric drive of the three-way tap - it works, I turned it with a screwdriver and the tap itself turns normally. I put it back together and it worked, but not for long, a week and again the AA error.

When the hot water supply is turned on, hot water only enters the hot water supply pipe for a few seconds (apparently at the moment the tap is switched on), and then all the boiling water goes into the heating circuit and after a while the AA error lights up. I took everything apart again, twisted it, but it didn’t help anymore. When the tap rotates inside in certain positions, clicks are heard like contacts of a relay or position sensor.

What could be the problem?

Answer: These contacts are the problem. perhaps they are simply broken or rotted or stuck. Disassemble, look, change. Another option is that the secondary heat exchanger may be clogged with salt deposits. Rinse and clean.

Question: Tell me, I heard that three-way valves often fail on Arderia 2.13 boilers. How can you extend their service life?

Answer: I can say that the three-way valve of the Arderia is normal (almost like everyone else’s) 🙂 the bottleneck is the seal of the drive axis (I suspect that there is no seal there at all). I take it apart as a preventive measure, fill the contact group with lubricant and reassemble it. In essence, a three-way tap valve is a switch for the flow of coolant from the main heat exchanger either to CO or to the DHW plate heat exchanger.

The three-way design uses contacts (we can call them limit switches), depending on the closed contact, voltage is applied to the first or second contact, when the desired position of the locking ball is reached, the contact is mechanically opened electrically. the engine stops. The CO or DHW circuit operates accordingly. The reasons for the failure are trivial: poor sealing of the locking ball drive shaft.

___________________________________________________________________________

What to do if the Vailant boiler does not heat hot water

Vailant boilers are particularly reliable and safe. Breakdowns of such complex equipment must be repaired by a specialist. But, minor faults can be removed yourself if you have a basic level of knowledge about the design of heating and heating boilers.

Most faults are indicated on the boiler display. Having deciphered the errors, you can figure out the reason for the boiler’s failure to heat water. Where to start searching if water heating in the Vailant boiler does not work and the indicator does not show an error or can it be interpreted in different ways?

Vaillant boiler does not heat hot water due to blockages

This is one of the most common problems. Most often, the reason is poor water quality - scale appears, components, filters and pipes become clogged.

If the flame does not light up in the boiler, start checking with the flow sensor. Finding this cylindrical device is quite simple. The flow sensor is located near the pump; the wires go to it. There are two sensors installed near the pump:

Pressure sensor in the heating system.
Flow sensor.

The flow sensor looks like a small fan; it begins to rotate as water moves through the pipes. If the flow sensor detects the movement of water, the automation receives a signal to turn on the gas and heat the water.

Gas boiler does not heat hot water

If the flow sensor is clogged, water will flow but the fan will not move. Accordingly, the signal to turn on the heating is not received. There are two ways to solve the problem:

Don’t rush to disassemble the boiler and try to “blow out” the system first. Close the valve general water supply Houses. Open the hot water tap and drain the system. Now the percentage of air in the pipes has increased. Start sharply opening and closing the water tap immediately in front of the boiler. These simple manipulations will help create pressure and clear the flow sensor fan of debris.
If “blowing” does not solve the problem, you need to open the boiler, unscrew the flow sensor and clean it manually.

If the Vaillant boiler does not heat hot water, the secondary heat exchanger should be checked. It also tends to get clogged quickly. But, fortunately, it can be easily removed, cleaned and reinstalled.

Clogging three way valve can also cause the boiler to fail to heat water. And you can remove this unit yourself, clean it and install it back.

Having bought the Vailant boiler, be sure to check with the seller information about the places where filters are installed. You can clean and change these components yourself.

Faulty pump

Heating of water in a Vailant boiler largely depends on the operation of the pump. To repair or replace this unit, you must call a specialist. But, you can check for yourself whether this is the reason for the boiler’s failure to work.

Set the water temperature on the boiler to 0 °C and turn on the water heating mode. During this time, monitor the operation of the pump. If after 20 minutes of operation it does not heat up, then the problem is with the pump.

The reason for the boiler’s failure to heat water may also be due to a simple loosening of the bolts at the connection areas. Carefully examine the boiler diagram and check that all connections fit tightly. Perhaps simply tightening the bolts will solve your problem.

Other materials from this section:

Main malfunctions of Ferroli gas boilers

Ferro gas boilers are produced by a well-known Italian company. they have excellent technical characteristics, and created according to modern advanced technologies. These units compete with the most famous manufacturing companies that produce similar equipment. Although…

How can you increase draft in a heating boiler?

From of this material You will learn how to increase the draft in the boiler, what to do if the draft in the boiler suddenly disappears, we will consider only the most effective methods draft effects in heating boilers. Draft in a furnace or boiler is the main process that provides heating to any room. If there is no traction, then...

Setting up the gas block on the Vailant boiler

Setting up the gas block for the Vailant boiler is carried out after installation work, connecting external regulators and sensors, thoroughly checking the tightness gas apparatus and connections. Work order: Vailant boilers are set up to operate at natural gas at the factory. Set up the burner...

Which boiler is better: wall-mounted or floor-standing?

Which boiler is better: wall-mounted or floor-standing? There is simply no clear answer to this question. Everything will depend on many factors, such as: Do you need to save money, or do you have enough money to buy; Features of the characteristics of the room in which…

___________________________________________________________________________

Repair and errors of gas boilers Viessmann Vitopend 100-W

Replacing a flow-through heat exchanger

Close the Viessmann Vitopend 100-W wall-mounted boiler from the side heating circuit and from the side of the DHW water supply circuit and drain the water from it.

Fig.8. Dismantling the flow-through heat exchanger

E - Heating circuit flow, F - Heating circuit return, G - Cold water pipe, H - Hot water pipe

Check the connections of the DHW water supply circuit for the presence of scale, and the connections of the heating circuit for contamination. If necessary, clean or replace the flow-through heat exchanger.

Work to replace a flow-through heat exchanger:

— Move stepper motor A slightly upward.

— Turn the stepper motor adapter B with stepper motor A 1/8 turn counterclockwise and remove it.

— Loosen the two screws C on the flow-through heat exchanger and remove the flow-through heat exchanger D together with the seals.

— Reassembly of the flow heat exchanger D is carried out in the reverse order using new seals. Torque of mounting screws: 5.5 Nm.

— During installation, monitor the position of the mounting holes and correct landing seals.

— Ensure the correct position when installing the flow-through heat exchanger. Observe the “Top” marking.

— Reassemble the hot water boiler in reverse order.

— Fill the hot water boiler with water, bleed (remove air) and check for leaks.

Temperature limiter and boiler sensors Visman Vitopend 100-W

Fig.9.

The boiler does not heat or does not heat hot water well: reason and solution

Removing the temperature limiter and boiler sensors Viessmann Vitopend 100-W

A - Temperature limiter, B - Boiler water temperature sensor, C - Hot water outlet temperature sensor (gas combi boiler), D - Draft stall control sensor, 5 - Temperature sensor DHW cylinder(gas single-circuit boiler)

Temperature limiter

Check to see if after emergency shutdown The gas burner control does not release, although the boiler water temperature is below 90 °C.

— Check the current flow of the temperature limiter using a universal measuring device.

— Remove the faulty temperature limiter.

— Install a new temperature limiter.

— To unlock, turn the regulator knob to a short time all the way to the right and then back. The ignition process is repeated.

Boiler water temperature sensor:

— Disconnect the cables from the sensor.

— The boiler water temperature sensor is located directly in the heating medium (risk of scalding).

— Before replacing the sensor, drain the water from the boiler.

Outlet temperature sensor (Viessmann Vitopend gas combi boiler):

— Disconnect the cables from the sensor.

— Measure the resistance of the sensor and compare it with the characteristic.

— If the deviation is severe, replace the sensor.

— Before replacing the sensor, empty the boiler on the DHW side of the circuit.

Traction stall control sensor:

— Disconnect the cables from the sensor.

— Measure the resistance of the sensor and compare it with the characteristic.

— If the deviation is severe, replace the sensor.

Temperature sensor for cylinder water heater (gas single-circuit boiler Visman Vitopend):

— Disconnect plug 5 from the cable harness outside the controller.

— Measure the resistance of the sensor and compare it with the characteristic.

— If the deviation is severe, replace the sensor.

Malfunction indication (error codes) of Viessmann Vitopend 100-W boilers and their elimination

A0 - Burner blocked

Gas pressure too low - Check gas pressure and gas pressure switch

E0 - Burner blocked

The draft stall control device has tripped - Check the gas duct. If the draft stall control device operates 10 times within 24 hours, the burner goes into fault mode (fault indication “F6”).

F2 - Burner fault

The temperature limiter has tripped - Check the filling level of the heating system. Check the circulation pump. Remove air from the installation.

Check temperature limiter connecting cables. To unlock, turn the regulator knob almost all the way to the right and then back (reset).

F3 - Burner fault

The flame signal is already present when the burner is started - Check the ionization electrode and connecting cables. Turn mains switch 8 off and on again (or reset, see F2).

F4 - Burner fault

No flame signal - Check ignition electrodes/ionization electrode and connecting cables, check gas pressure, check gas control valves, ignition, ignition transformer.

F6 - Burner fault

The traction control device has tripped - Check the traction control sensor.

F30 - Burner blocked

Short circuit of the boiler temperature sensor - Check the boiler water temperature sensor.

F38 - Burner blocked

Broken boiler temperature sensor - Check the boiler water temperature sensor.

F50 - No hot water preparation

Short circuit of the temperature sensor of the cylinder water heater (gas single-circuit boiler Visman Vitopend) - Check the sensor.

F51 - No hot water preparation

Short circuit of the hot water outlet temperature sensor (Viessmann Vitopend gas combi boiler) - Check the temperature sensor.

F58 - No hot water preparation

Break in the temperature sensor of the cylinder water heater (gas single-circuit boiler Viessmann Vitopend 100) - Check the sensor.

F59 - No hot water preparation

Breakage of the hot water temperature sensor at the outlet (gas combined water heating boiler Visman Vitopend) - Check the sensor.

b0 - Burner blocked

Short circuit of the traction control sensor - Check the traction control sensor.

b8 - Burner blocked

Broken traction control sensor - Check the sensor.

Possible reasons for changes in room temperature

The rooms are too cold:

— Incorrect setting of the room temperature controller — Set the room temperature controller to the desired room temperature.

— Heating system is switched off — Turn on the mains switch. Turn on main switch if available (located outside the boiler room). Check the fuse in the electrical distribution panel (house input fuse).

— Incorrect controller setting — Set the regulator knob to a higher coolant temperature.

— Priority for hot water preparation — Finish hot water extraction or wait for the cylinder to finish heating.

— Fault indication on the display: The “U” symbol and a fault code appear, for example, “F2” — Turn the control knob almost all the way to the right and then back (reset). If the fault indication appears again, contact your heating company.

— Air in heating installation— Remove air from the radiators.

— No fuel — Open the gas shut-off valve.

— Malfunction in the system supply air or in the gas path - Contact your heating service.

— Circulation pump defective - Contact customer service.

The rooms are too warm:

— Incorrect setting of the room temperature controller — Set the room temperature controller to the desired room temperature

— Incorrect controller setting — Set the regulator knob to more low temperature hot water.

___________________________________________________________________________

DIY geyser repair Oasis

Today we will look at repairing the Chinese gas water heater Oasis with our own hands step by step.

The most common malfunction of the Oasis geyser is the failure of the water block membrane. However, the Oasis usually does not light up. It is not difficult to identify this malfunction, and you can do the repair yourself. We will look at disassembling the column below. To begin, remove the column body, set the water flow regulator on the water block of the column to the fully clockwise position and open the hot water tap. At the same time, we look at the microswitch, which is located in the middle - between the gas and water blocks of the column. If the membrane is working properly, then the rod of the water block presses on the tab, which releases the microswitch button, accordingly the column should make a crackling noise and light up. If the foot moves away from the microswitch well, but there is no clicking sound, then the microswitch is most likely faulty. It can be checked by disconnecting the connector and shorting the contacts.

Let's consider the case when the foot barely moves, or stands completely motionless when turning on the water in the tap. It is likely that the membrane of the water block is torn and the pressure necessary for the movement of the water block is not created. One more frequent malfunction is a leak in the stuffing box of the Oasis geyser. A seal leak usually leads to a breakdown of the same microswitch, because drops drip onto it. If you find this particular malfunction, then do not waste time and change the oil seal assembly, otherwise your Oasis will soon stop igniting and turning on. Spare parts for repairing an Oasis gas water heater are not expensive, and I advise that if you are trying to disassemble the water block of an Oasis gas water heater, immediately change both the membrane and the stem seal assembly. Essentially these are consumables. It will be a shame later when, having changed the stuffing box, you are faced with replacing the water block membrane a month later, or vice versa. From experience, I came across something else... Let’s say you replaced a new membrane, your oil seal didn’t leak, it seemed like they left it... But it either leaked after a week, or, what’s even worse, when the water was turned off, the column continued to burn, overheated, spit out steam, something happened something even more unpleasant if you didn’t have time to turn off the gas. Why did this happen? It's simple.. The water block rod in the stuffing box unit did not go all the way, but after replacing the membrane it began to go all the way. When the rod barely moved, it was overgrown with salts and rust in the place where it did not go into the oil seal... Then everything is clear. The abrasive rod either erases the oil seal ring, or it may even jam there and not return to its original position. If you are lucky, then after this, at least the heat exchanger of the column will not leak, otherwise you will end up with expensive repairs

This means that a malfunction in the water block of the gas water heater has been found and you can consider how to repair the Oasis gas water heater with your own hands and disassemble the water heater. So, let's start step by step:

1. Remove from the gas water heater handle 1 for adjusting the gas supply of the gas block, handle 2 for adjusting the water flow of the water block, handle 3 for switching the gas water heater to winter/summer mode.

2. Find two self-tapping screws securing the speaker housing cover to the rear wall of the Oasis speaker from the bottom right and left and unscrew them. It is usually difficult to get to the screws. Next, remove the front panel of the Oasis geyser from the upper hooks of the rear wall of the column.

3. Carefully, so as not to tear, disconnect the connectors of the wires that go to the column display from the control unit and from the temperature sensor.

4. Unscrew the two screws that secure the water block of the Oasis speaker to the back wall.

5. Unscrew the two screws that secure the geyser heat exchanger tube to the water block and release the pressure flange. Remove the tube from the water block.

6. Disconnect the microswitch connector. The photo shows that he is wrapped in cellophane. The stuffing box assembly was leaking on this column, and so they decided to “collect it” in order to save the microswitch.

7. Disconnect the wires from the gas solenoid valve.

8. Disconnect the ground wire from the gas block by unscrewing the screw.

10. Disconnect the two screws that secure the block of ignition and ionization electrodes to the burner of the Oasis gas water heater. Let's remove the wires going to the electrodes.

11. Unscrew the 2 screws that secure gas block speakers to the rear wall.

Why did the double-circuit gas boiler suddenly stop heating hot water?

Disconnect the power wires 1 from the battery compartment 2 of the geyser.

13. Now nothing prevents us from dismantling the water-gas unit and burner assembly.

14. I tighten the two halves of the column water block housing with 4 screws. To disassemble the block, we need to unscrew them. Most likely, you won't be able to do this if you go in there with a screwdriver. The screws are made of low quality steel and you will strip the splines. To prevent this from happening, I advise you to first rip off the screws with something like pliers, and then calmly turn them with a screwdriver.

15. The block is halved.

16. Remove the water block membrane 1 and the water block rod plate 2.

16. Under the plate of the water block rod there is a hexagon - this is the visible part of the stuffing box assembly. We need to unscrew it. Usually it unscrews easily, but the hexagon is 15 or 16 (not a common size in Russia). The edge is very thin, it is difficult to catch it with a key. Don't rip it off.

17. In this photo we see the stuffing box assembly that I removed.

At this point we have completed the disassembly, now the Oasis Geyser can be assembled in the reverse order by changing the stuffing box and membrane. I also change the microswitch if water drips on it. But this is at your discretion. I hope my article was useful to you, and you made repairs and fixed the problems yourself. If you don't want to bother with finding spare parts and self-repair, then contact me, I will come for repairs

https://gazmaster34.ru/remont-gazovyh-kotlov.html

I hope you find the instructions on geyser Oasis. Download

In this article I will describe how I treat this problem. This way you can also get out of the situation if you have a double boiler with a plate heat exchanger.

My house has a well and the water is very hard, so I constantly have problems with hot water. To remedy the situation, I use citric acid.

This is the task. How to deliver this acid to the inside of the heat exchanger with the least effort. I found this way. At the entrance to the boiler I have a magnetic converter, which is supposed to remove water hardness, but it does not remove it, in my opinion this is a fiction. But the good thing for me is that it is installed right at the entrance to the boiler. You can see it in the photo below.

There is an American nut on it; after unscrewing it, you can easily pour citric acid into the inside of the pipe.

But to do this you need to turn off the water. I have a collector next to the boiler. He is in the photo below.

Now all the channels on it are open and with one easy movement I turn off the water supply to the boiler.

All water is shut off, now you can unscrew the American connection on the magnetic filter. And don’t forget to come up with something from the flowing water from the boiler, there isn’t a lot of it, but it is there. I wrapped up the rag.

Then I pour citric acid into the inside of the pipe.

I screw the American valve back and open the tap for supplying tap water to the boiler.

Next, you need to turn off the tap so that your household does not drain all the acid ahead of time.

I charge the system at night and it stays acidic until the morning. In the morning I open the water supply tap to the boiler and drain all the acid. The water will hiss, don’t be alarmed.

The question may arise, will the acid eat away at the heat exchanger? I did some digging on the chemists' forum and came to the conclusion that organic acid (citric acid) is harmless to copper.

I use this method when necessary. If you don’t like how the boiler heats the water or the pressure of hot water has become weak, I take the heat exchanger and treat it with citric acid.

If you have connections to the boiler made of polypropylene, and there is no place to put the acid, then come up with something similar; it won’t take much time.

Water heaters are used as the main or additional source of hot water supply in apartments and country houses. A complex device may fail due to various reasons, breakdowns cause a lot of everyday inconvenience and require urgent elimination. Let's take a closer look at why cold water does not flow into the water heater, why the pressure may decrease, and why difficulties arise with heating.

Water heater

Why is the water heater not working?

First of all, you need to figure out the cause of the problem. Most often, owners of water heating equipment encounter the following malfunctions:

The water pressure at the outlet of water heating equipment decreases.
The boiler takes in water and heats it, but there is no water coming out.
Water does not flow into the tank of the water heating unit.

The boiler is complex system, consisting of many pipes of various diameters, filters, valves and valves. Failure of any node can lead to malfunction of the entire system.

Boiler design

Here are the main causes of malfunctions:

Deposition of insoluble carbonate salts (scale) on pipe walls, valve parts or valves.
Ingress of rust particles.
Blocking the flow of water with an air bubble.
Failure of the valve or valve (jamming of parts).

First of all, you need to find the problem node. To do this, sequentially disconnect the parts from the inlet and see after which unit water stops flowing into the system. Once the problem area is found, repairs can begin.

Important! Any actions related to opening the casing of the water heating device lead to loss of the right to warranty service. Proceed with work only if the warranty period has expired. Otherwise, it is advisable not to violate the warranty rules, but to contact the service center.

Trouble-shooting

Having discovered a problem unit, you need to begin restoring the boiler’s functionality. The procedure depends on the specific reason that is interfering with the normal operation of the device. Let's look at the most common situations.

Scale clogged

Water heater clogged with scale

Scale is deposits of insoluble carbonate salts on the walls of water heating devices. It is found in teapots, washing machines, water heaters.

The amount of scale depends on the hardness of the water. In regions with hard water, even after a year of operation of the boiler, the amount of salts deposited on the walls may be sufficient to completely block the lumen of the tubes heating element or significantly narrow it.

If scale causes the water heater to fail, repairs must be carried out in the following order:

Open and remove the protective cover from the water heater.
Unscrew the nuts holding the heating element in place and remove it.

Dismantling the heating element

Wash the boiler walls and heating element coil from carbonate deposits. Organic acid - lemon or oxalic acid - will help dissolve the hard crust. Can also be used industrial products– anti-scale. Soak the part in an acid solution to free it from accumulated deposits.

Cleaning the heating element from scale

Using a tester, make sure that the heating element coil has not burned out due to a violation of heat removal by scale.
If the spiral is intact, assemble the device in order, reverse order dismantling.

If the heating element fails, you will have to look for a new one or buy a new boiler - you need to choose the most economical solution. If repairs require large financial expenses, it is more profitable to immediately purchase new equipment.

Failure of the pressure reducer

The pressure drops of the incoming water in the system can range from 2.5 to 7 atm. To compensate for surges, a special unit is installed at the boiler inlet - a gearbox. Its task is to ensure equal pressure at the outlet of the boiler and from the tap. If it falls due to a gearbox failure, it is necessary to adjust its operation or replace the broken part.

Low pressure in the main water supply also leads to a drop in pressure at the outlet of the water heating boiler or in instantaneous water heater. Unscrew the hose and check the pressure level: if water comes from the main water supply in a thin stream or does not flow at all, you should wait, as the problem may arise due to repair work. If the pressure has not been restored within several hours, you should contact Vodokanal.

Thermostat failure

If the water leaving the boiler does not heat up enough or does not heat up at all, the cause may be a failure of the thermostat - it is he who is responsible for maintaining constant high temperature. To carry out diagnostics, turn off the power to the boiler and remove the thermostat from the housing.

Press the thermostat button.
Heat the copper tip of the thermostat. If the node is working properly, the button should turn off.
Call electrical circuits thermostat using a tester.

Typically, a thermostat malfunction is caused by the overheat protection tripping. As a result of the operations performed, the device should work, and the problems will disappear after it is installed in place. If the tester shows an open circuit, you will have to replace the burnt out thermostat.

Faucet clogged

If water comes out of the boiler with sufficient pressure, but flows out of the tap slowly, the reason lies in the faucet being clogged with scale or rust. You will need to turn off the water, disassemble the faucets and thoroughly clean the filter mesh. You also need to inspect all the rubber seals and make sure that the valves are working properly.

If water does not enter the boiler

If the described reasons have been eliminated, there is water pressure, but the boiler still cannot be filled, the cause may be an incorrect connection (the inlet and outlet pipes are mixed up) or a clogged mesh filter pad. It's easy to fix these problems: unscrew the hoses, rinse the filter and put everything back in the correct order.

Water heater operation diagram

Another cause of malfunction is breakdown check valve. It is installed at the entrance to storage tank and prevents water from returning to the water supply. It can also release excess pressure when overheated. Over time, the valve spring becomes clogged with particles of scale and rust, causing the valve to jam. Disassembly and thorough cleaning will help resolve the problem. If it was not possible to clean the part and restore its functionality, you will have to look for a replacement.

Having figured out why the boiler may stop working normally and how to eliminate the most common malfunctions, it is worth focusing on preventive measures.

Most breakdowns can be avoided by following simple recommendations care:

Do not overheat the water. Lower temperatures mean scale forms more slowly, leading to breakdowns.
The design of many boilers includes the use of softening cartridges. Don't skimp on water softening, as this will help you avoid spending on repairs.
When leaving for several days, turn off the device without draining the water. But turning it off at night to save energy is impractical due to the high wear and tear on the electrical part.