DIY Junkers double-circuit boiler repair

Heating systems for country and country houses. Boilers, gas water heaters, water heaters - Repair, service, operation. Recommendations for assembly and installation.

Question: The pressure gauge does not work on my Junkers boiler - what could be? The boiler is new. I replaced the pressure gauge - the result is the same.

Answer: The channel is clogged, the manometer connection point, no water enters the capillary tube.

Question: The Junkers Euroline 23 boiler stopped switching on stably. It turned out that the gas supply valve did not open. The reason is insufficient opening voltage. It was 35-37c, 60c needed. Replacing the electronic board resolved the issue. Is there an electronic circuit for this board? On a new board, 50 kOhm. The rest of the diodes and transistors (without soldering from the board) give the same readings, i.e. can be considered as workers. Could this decreasing resistor affect the voltage drop?

Answer: The resistor can hardly influence, but the coil control transistor can.

Question: a couple of weeks ago, an incomprehensible and unpleasant sound suddenly appeared in the boiler: the impression is that a ratchet works in some kind of "organ" of the boiler. It is impossible to determine by ear. But when you touch the gas valve, you can clearly feel the sound from there. Although it is possible, sound vibrations are transmitted through the boiler fittings. The sound occurs periodically, regardless of whether only the boiler or DHW is working with it. Can anyone have similar problems with such symptoms?

Answer: It is necessary to thoroughly clean the pump, if you are not confident in your abilities, invite a specialist, the part is expensive.

Question: Problem: DHW heating does not work indirectly, heating is in working order! I just stopped heating and that's it!

Answer: Check the DHW flow sensor

Question: Boiler Junkers zs 23-1 ae is a single-circuit boiler with the possibility of heating hot water in a DHW cylinder! The sensor is connected, it does not show an error. Doesn't heat water. When restarting, the yellow indicator blinks twice, the first on the temperature display panel, and the boiler goes into standby mode. When the temperature sensor contact is disconnected, the boiler ignites and immediately goes out. Heating works without interruption. DHW heating was working.

Answer: It is necessary to check the boiler sensor.

Question: Tell me, the water does not pass through the boiler to the hot water supply, where to look?

Answer: If you have a Junkers Euroline, then at the cold water inlet to the boiler.

Question: Help with this question. Junkers Evroline zw 23 did a great job for one season and strange things started happening in this one. After using cold water, closing the tap, the boiler turns on for 5-10 seconds and goes out. The heating circuit works fine. The service technician said it was a hydraulics problem. This begs the question, why did it work normally before and how to fix it?

Answer: Eliminate? Remove water hammer in the cold water pipe at the boiler inlet when it is closed on the mixer - for example, put a check valve.

Question: Boiler Junkers Euroline ZS / ZW 23-1 AE. Stable, once a year, I have a problem with hot water supply. The fact is that when you open the tap to supply hot water, it (water) flows warm, not hot, but at the same time, the batteries get very hot.I call the foreman and he cleans the valve, which, in his opinion, is clogged with tap water. I downloaded the instructions for the boiler, but it does not say anything about the procedure for cleaning the valve, so I ask for your advice. To clean the valve, it is necessary to completely dismantle the entire assembly, or can this be done without removing it? Maybe there is at least a brief description of such a procedure?

Answer: The 3-way valve can be removed quite easily, after draining the heating water from the boiler, try replacing it if you are tired of repairing it.

Question: There was a problem with the Junkers ZW-23-1 KE 23 boiler worked fine, and this winter it all started. At first, the boiler could not turn on normally, turn on and off + turn on and off + turn on and off and so for 20-30 minutes it could do as if it did not have enough gas to ignite. DHW was working fine at this point. The serviceman can offer nothing but cleaning the boiler, but I say to him, in my opinion, the matter is in the gas part, the boiler is serviced 2 times a year. And yesterday the column started to drive - it turns on there is a frantic noise of gas and after 5 seconds it turns off and cannot turn on normally. It will take some time, then it will work. Tell me where to start?

Answer: clean or replace the ionization electrode. Perhaps the problem is in the board, the board does not see the minimum flame, check the capacitor C4 in the boiler.

Question: The Junkers Evroline zw 23 ke boiler heating is working normally, when the hot water tap is opened, there is a strong (noisy) gas combustion - then the burner turns off-on again. etc. With a slow opening, it seems in the mode, but if you open the tap somewhere else, everything repeats. The heat exchanger has just been cleaned.

Answer: Check the gas valve settings according to the instructions.

Question: I have a Junkers boiler zw 23 ke 12. There is a problem for a month now. I turn on hot water, the boiler starts to make noise and a sound begins in the pipes, as if they are being hit with a hammer and the water does not heat up. The fault reset key flashes about once every 4 seconds, but the temperature shows either 90 or 45. What could be the problem?

Answer: If the pressure in the boiler is correct and the pump has not jammed, the heat exchangers will definitely be flushed. Also check the air vent and volume compensator.

Question: Junkers Euroline ZW23KE boiler (installed 10 years ago). After a thunderstorm, flashes red and green 75. What could be? The board refused?

Answer: See flame control circuit.

Question: Boiler Junkers Euroline 23-1. Turbine. An error of the following form: The fault reset button is flashing, and the diodes are at 45 and 90 degrees. According to the instructions - the pressure sensor does not work. If I understand correctly the pressure sensor is it the same pressure switch? I tried to reset the error through CUT, but the result is the same. I removed the case, blew the venturi tube, blew it into the pressure switch too, maybe the contacts somehow got stuck, they jiggled normally. Then, through the reset button, he removed the error and the boiler started up. But after half an hour, the picture is again the same. Tell me what it can be and how to check it. Maybe for resistance or whatever. (there is a multimeter). Or is it a matter of the board. Or buy a new pressure switch?

Answer: 1 - check the moment of the accident - if the turbine is working, 2 - if it works, then check the voltage on the pressure switch with a tester.

Question: The pressure sensor stopped responding, unscrewed it, blew it out with water pressure - it works, put it back in place, filled it with water does not show. I unscrewed the sensor, when the system is filled with water, there is no water in the place where the sensor is connected, I fill it, the bypass is activated, and there is no water at the junction of the sensor, I unscrewed the plug located below, blew everything clean. What needs to be done for water to flow into the sensor?

Question: Such a problem - the Junkers Euroline zw-23 KE 2321 DHW boiler works normally, after turning on the boiler for heating it works for an hour or half an hour and turns off, after 3-4 hours it turns on itself and again the same story.Once, when I opened the tap for adding cold water to the system, the boiler began to work, after turning off the tap it immediately turned off. please tell me what could be the reason.

Answer: you need to check everything, I would start with an NTC sensor.

Question: I have a Junkers Euroline boiler. In operation, it worked fine for 5 years, but recently it has become poorly started on heating, there is an arson, a gas flash and immediately goes out, then after 10-12 seconds everything repeats and so on 6-10 times until it starts. The impression is that the gas valve does not open. Tell me what you need to do to fix this?

Answer: Clean the ionization electrode and possibly repair the board.

Question: Tell me who has come across this: when hot water is started, the boiler lights up, but after 1-10 minutes it turns off and the first light blinks. Then the boiler can be started only after disconnecting the power supply for a couple of minutes. What could it be??

Answer: NTC flow line or pump.

Question: There is a Junkers Euroline ZW-23-1-AE turbocharged boiler. The turbine is working very loudly. When inspecting the turbine, I found a fairly large anchor play (1.5-2mm). The inner bearing rotates with a slight extraneous sound, but the loud sound comes from the backlash. The reason for the appearance of backlash, I thought, was the shift of the inner bearing along the axis of the armature. But it is fitted very tightly, and slight (so as not to damage the bearing) attempts to move it along the axis did not lead to anything.

1. In general, is it possible to change the inner bearing of a turbine or is it not practiced by anyone?
2. In the case of replacing the turbine, can you put in a less powerful one so that it does not buzz so much? I have a 50W turbine, maybe there are 25-30 watt turbines. The heated area is about 60m, the boiler always operates at minimum output.

Answer: The backlash is not from the sound of the turbine! If you can - Change the bearing.

Question: Turbocharged boiler Junkers Euroline. Heating works out decently, but the hot water supply is playing pranks. In the draw-off mode, it heats both hot water and heating. Replaced the 3-way valve insert with a new one. The drive operates DHW heating. I washed the secondary heat exchanger on the heating side - there was debris, but not critical. I removed the 3-way drive, pressed the stem all the way down - the result is the same, both hot water supply and heating are working. Give advice.

Answer: Incorrectly assembled three-way valve, debris.

Question: Good day, everyone. I have a Junkers Evroline ZW23KE boiler installed. Now the following problem has appeared: on heating, the burner works in medium mode, and with hot water supply (the temperature regulator is in a higher than medium position), the maximum flame immediately turns on, the heat exchanger starts making noise like a kettle before boiling. The temperature on the indicators reaches 90 and the gas supply is turned off. The temperature was lowered by the flow of water - the gas turns on and everything starts from the beginning. If the DHW regulator is in a position less than average, the maximum flame turns on, then the flame decreases to medium and then it works with a constant flame change (either increase, then decrease). I suspect it's time to clean the plate heat exchanger. For 8 years of operation, I have never cleaned it. But since not completely sure of my conclusions, so I decided to consult with you. Have I identified the problem correctly?

Answer: And the primary heat exchanger also needs to be cleaned.

Question: Junkers Euroline. The pressure switch does not work. Pull with your mouth - it works. The turbine is spinning, but there are no discharges on the tubes. The exhaust pipe is in order. Not crammed anywhere. Has the turbine started to blow weakly?

Answer: Replace or blow out the venturi, adjust the pressure switch.

In this article we will try to tell you how to make gas boiler repair DIY Junkers ZW 23-1, ZW24-2AE, KE ... These are one of the most common models in the range of Junkers and Bosch boilers.

... First of all, if these boilers break down, you should find the instructions for the Junkers boiler with the model you need.These models of boilers are equipped with a self-diagnosis system and signal that an error has occurred in the operation of the boiler. In models ZW23, ZW23-1, depending on the type of malfunction, the alarm LED and one or more temperature diodes flash.

Junkers boiler malfunction

Modern gas boilers are quite sophisticated technological equipment. With proper care and proper handling, the gas boiler will serve for a long time without any interruptions. However, even the most expensive and functional equipment has its own resource, after the exhaustion of which all sorts of malfunctions begin to appear.

DIY gas boiler repair

Knowing the main causes of malfunctions and the procedure for eliminating them, you can repair your gas boiler with your own hands. This is a very painstaking, responsible, but in most cases relatively easy job.

Contents of step-by-step instructions:

First of all, it is necessary to establish why any malfunctions may occur in the operation of gas heating boilers. A number of different factors can lead to problems.

Modern gas boilers are equipped with various automation equipment. These funds, in turn, are powered by electricity. And, despite the fact that the 21st century is already in the yard and systems for the use of alternative energy sources are being actively developed around the world, the problem of stability of power grids remains relevant for many regions, especially for remote villages and all kinds of summer cottages.

A sudden power outage or a strong surge in electricity is one of the main enemies of any modern gas boiler.

To avoid all the accompanying troubles, buy a quality stabilizer in advance. Do not spare money to buy this device - there is little sense from cheap models, so it is better to immediately allocate funds to purchase a good stabilizer from a well-known manufacturer. Be sure that in the event of a breakdown of the automation, you will spend much more money on its repair and replacement.

At home, wall-mounted models of gas boilers are often used. Such devices are simultaneously responsible for both space heating and hot water preparation.

The design of wall-hung boilers includes a flow-through heat exchanger. Low-quality hard water with various impurities is the main enemy of the heat exchanger of a gas boiler. At the same time, under the influence of low-quality water, the heat exchanger can fail in just one season.

Install special filters to prevent such damage. The best option is a complete water purification system. With it, your boiler will work as long as possible, and using purified water is much safer for health.

Any knowledgeable person will tell you: only qualified specialists should be engaged in the installation and piping of gas heating equipment.

Even the slightest mistakes at the stages of installation and connection of equipment can lead to irreversible consequences. For example, an incorrectly executed piping in the case of a cast-iron gas boiler more powerful than 50 kW will lead to the fact that the unit will simply split at low temperatures.

If you are not an experienced gas operator, entrust the boiler installation to professionals.

Therefore, if you are not an experienced gas operator, entrust the installation of the boiler to professionals - this way you will save yourself from many problems in the future.

Unfavorable weather conditions can also lead to the appearance of many different problems. In frosty winters, people turn on the heating at almost full capacity. This leads to a significant decrease in pressure in the gas pipeline system. As a result, boilers cannot fully realize their potential.

You will not be able to solve this problem on your own - you still cannot explain to your neighbors that by their actions they only aggravate the situation. As a solution to the problem, you can install an additional boiler that runs on a different fuel.

Automatic solid fuel coal-fired boiler with hopper

A modern gas boiler is a complex and potentially dangerous system. The main danger of such units is the risk of a gas explosion in the event of improper handling of the equipment or untimely elimination of various malfunctions.

Various kinds of automation are responsible for maintaining the operation of the gas boiler at an optimal level. An inexperienced user is often unable to understand its device. Therefore, it is better to immediately invite specialists to troubleshoot serious problems.

On your own, you can try to eliminate only visible damage and various contaminants that have led to the failure of the pipe, chimney and other parts of the boiler.

Typical malfunctions of gas boilers

There are a number of typical problems that you can fix yourself in most cases. Problems will also be listed, in the event of which you can only protect yourself before the arrival of a specialist.

If a distinct smell of gas or smoke appears in the room, immediately turn off the boiler and leave the room, opening it for ventilation.

Gas boiler functionality diagram

Call a professional immediately. Trying to solve the gas leak problem on your own without the necessary skills is extremely dangerous and unreasonable.

If the flame sensor or the gas supply pipe breaks down, turn off the boiler, close all gas valves and let the unit cool down completely.

Return to the area after a while to check for the smell of gas. If everything is in order with the draft, try to turn on the boiler again. If there is no thrust, immediately call a repairman.

Overheating is one of the most common problems in modern gas boilers. The reason for this may be a malfunction of the automation equipment or a clogged heat exchanger.

It is impossible to cope with the repair of automation without the appropriate knowledge.

You can also clean the heat exchanger with your own hands. The most common materials for the manufacture of heat exchangers are copper and stainless steel. There is usually no problem cleaning them, but be extremely careful anyway.

Primary heat exchanger for wall mounted gas boiler Beretta

According to the recommendations of the manufacturers, the heat exchangers must be cleaned of soot every few years (each manufacturer indicates a specific interval in the instructions for their equipment).

Primary heat exchanger (heating circuit) of the gas boiler Rinnai SMF

To clean the heat exchanger, simply remove it and clean it thoroughly with a metal brush. In the case of a copper heat exchanger, it is best to replace the brush with a metal sponge used for washing dishes.

The problematic place of fans is their bearings. If the fan of your boiler stops developing the set number of revolutions, try to eliminate the problem as soon as possible.

Fan (3311806000) for Daewoo gas boiler

To do this, remove the back of the fan, take out the stator and lubricate the bearings. Machine oil is fine for lubrication, but it is best to use a higher quality carbon compound with heat-resistant properties if possible.

Fan RLA97 (Aa10020004) for gas boiler Electrolux

Also, an interturn short circuit can lead to problems with the fan. Only a specialist can cope with the elimination of this malfunction. Return the stator for repair to replace the winding, or immediately replace the faulty unit with a new device.

Gas boiler chimney diagram

Often, excessive clogging of the coaxial chimney leads to the appearance of various malfunctions in the operation of a gas heating boiler.

Remove the chimney and thoroughly clean all of its components from soot. So you will not only return the previous level of efficiency of the unit, but also significantly increase the efficiency of the boiler.

The boiler can shut down spontaneously for several reasons. This usually happens due to a malfunction of the combustion sensor. This problem, in turn, most often leads to contamination of the gas pipe.

Draft sensor 87 ° C for Thermona boiler

Remove the branch pipe, rinse it thoroughly with water, clean it with a cotton swab and blow it off the remaining moisture. Put the pipe back in place and try to turn on the boiler. If it doesn't help, call the wizard.

No wonder they say: the best repair is prevention. Gas boilers require annual preventive maintenance, which must be carried out before the start of the heating season.

Whenever possible, maintenance should be carried out twice a year, before and after the heating season.

Check all the previously discussed boiler elements for their serviceability. Follow the preventive maintenance recommendations given by the manufacturer in the instructions specific to your boiler. Eliminate any malfunctions that arise in time, if possible.

Remember! A gas boiler is a potentially hazardous equipment. Incorrect use and untimely troubleshooting can lead to irreparable consequences. Therefore, be careful and do not engage in any repair work if you doubt your ability and correctness of action. Otherwise, follow the instructions provided.

I think the topic will be useful to people who have such equipment at home.

We bought this boiler 6 years ago, in general it works fine, but once a year you need to do prophylaxis (flushing the radiators). otherwise, because of scale, the water will not heat up. The first time the boiler mocked three years ago, the problem was this, the water quickly heated up to boiling water, after which the electronics turned off the gas supply, the water immediately cooled down and it turned out that hot water was flowing from the tap in turn the water, then cold. The lamps on the boiler itself also showed that the boiler was overheating. Since it is unsafe to work with gas, especially for a person who does not understand such equipment, it was unsafe to call the master, so to speak from the official service, in Nizhny Novgorod this is a city gas company. Two masters arrived, disassembled the boiler, washed the radiators at a special stand, everything worked right away, I gave 3000 rubles for the work. When they did their work, I was with them and remembered how and what they do, because I constantly pay repairmen expensive, it's better to learn it yourself, everything will come in handy in life.

After their preventive maintenance two years passed and again I asked for preventive maintenance from the boiler. I did not call the craftsmen. but decided to see it for himself, in the end it turned out to be enough to rinse the magnetic filter that is at the inlet of cold water to the boiler and it all worked, i.e. 3000 in the family budget, were saved. And before the new year, the boiler turned on again (according to the law of meanness, it always fails in winter, when, in addition to hot water, it works to heat the house) This time, the problem turned out to be different, at first the water flowed hot and then warm and then cold. I have the added opinion, the copper radiator is clogged and it simply does not have time to warm up the running water in the secondary radiator. Since the filter was not too clogged, it was decided to disassemble, the radiators and rinse. Immediately, there is no difficulty, the main thing is not forget to shut off the gas and water before starting work and do not climb at all where the gas passes, but only where the water goes.

2.Turn off 3 taps for heating supply and return and water supply.

3. Remove the front covers from the boiler

4. Release the water pressure in the boiler, open the hot water tap to drain the water into the sink and drain the water with the tap on the boiler itself.

5.Remove the upper radiator, in order to remove it, you need to unscrew 6 screws, remove the trap for gas combustion products and unscrew the two nuts with which it is attached to the water system

6. Remove the stainless steel radiator. It is fastened with two screws from the bottom.

Gas boiler complex mechanism... It can be divided into 3 main parts: electronics, gas pipes and burners, heat exchange unit (pump, tank, fan). Only the last part can be repaired on your own.

Attempts to restore the first two parts, without proper skills, will lead to final breakdown boiler, gas leakage and other negative consequences.

Gas boilers rarely break... This is due to natural wear and tear equipment, or because of factory marriage... Other cases of breakdowns are necessarily associated with the following factors.

The boiler can break down due to water. At risk, first of all, there are two-circuit devices used not only for heating, but also for hot water supply.

The fact is that rust from the pipeline, other fractions, clog the thin tubes of the heat exchanger during the year.

Avoiding troubles with water quality can help coarse filter... It is installed during installation per feed pipe liquids. For greater security, you can add to the system fine filter, or install a complete cleaning system.

Household appliances are resistant to power surges and shutdowns electricity. But a gas boiler is a finer piece of equipment. A power surge will cause the boiler to shut down or damage the electronics. A malfunction of the device or a power outage will lead to freezing of the heating pipes.

In order to avoid sad consequences, they establish at least one of the additional devices.

• Stabilizer - a device that will solve the problem of power surges. Its size is small, it is installed both in an apartment and in a private house.

Photo 1. Electronic voltage stabilizer Resant Lux for a heating boiler. The device is wall-mounted.

• Uninterruptible power system. Will equalize the input voltage. Allows the boiler to work for a while in the absence of electricity. Suitable for use both in the apartment and in the house.
• Gas generator. It does not affect the stability of the network in any way, but it can save with a prolonged power outage. Used only in the private sector.

Attention! When buying a generator, check if it really is single-phase.

Installation of complex equipment layman will entail serious consequences. In frequent cases, the following problems occur:

• During installation neglected grounding... This leads to a build-up of static on the body of the device. When an electric arc occurs, the boiler automation often fails.
• After installation did not release air from the system... The resulting plug will lead to rupture of the coolant pipes and damage to the pump.
• Harness violations a gas boiler system, with a cast iron heat exchanger, will cause a split in an important part of the apparatus.

If the installation of the gas boiler is carried out correctly, operational problems arise only due to weather conditions... In cold winter, the desire to keep warm pushes people to use the boiler at maximum mode. The equipment withstands such conditions, but the gas system does not. A decrease in fuel pressure leads to interruptions in the operation of the apparatus. The automation starts to turn off the boiler. The problem is that this cannot be called a breakdown and it will not be possible to eliminate it.

Any malfunction of the gas boiler must be dealt with by a specialist. However, the opportunity to use the services of a master is not always there, and breakdowns are trivial... Let's consider the problems that can be solved on our own.

Usually the smell of gas appears when it leaks from the threaded connection of the supply hose... If there is a smell in the room where the boiler is installed, you need to open the window and turn off the boiler... Then follow the instructions:

1. Prepare the necessary things: soap solution, FUM tape, open-end wrench or adjustable wrench.
2. To apply mortar on all threaded connections. If bubbles begin to inflate, the leak has been found.
3. Close the gas valve.
4. Key expand the connection. Rewind on the external thread of the FUM tape and collect everything back.
5. Reapply solution and restart the gas supply.
6. If the leak has been repaired and the gas smell has disappeared, remove leftovers solution.

Attention! When it was not possible to find the leak, turn off the gas, call a specialist.

If during the operation of the boiler the sound emitted by the turbine has disappeared or has decreased - indicates a malfunction of the blowdown fan. For repair you will need: screwdriver, new bearing, cloth, grease.

1. Necessary turn off boiler and turn off the gas.
2. Remove the turbine.
3. With a rag to clear with turbine blades dust and carbon deposits.
4. Inspect Electric Coil fan for blackening. If everything is in order, move on or replace the fan.
5. Disassemble the fan housing. Inside the turbine shaft is installed bearing, his needs to be replaced. Some fans have sleeve instead of a bearing. In this case, her need to be lubricated.

The turbine may also not work due to undervoltage or malfunction of the control board. The first is eliminated with the help of a stabilizer, but the second only by calling a specialist.

Chimney problems arise only at boilers floor type... This is due to its size and vertical position. Hinged devices do not need to clean the chimney.

Chimney consisting from metal parts, cleaned with a metal brush. It must be disassembled and the accumulated soot removed mechanically. Whole the chimney is cleaned with special vacuum cleaners or chemicals. But for this you need to call a professional.

Photo 2. Three ways of arranging a chimney for a floor-standing gas boiler. The first option is the hardest to clean.

Boiler overheating is associated with contamination of the heat exchanger... To clean the device you will need: special hydrochloric acid solution, adjustable wrench, FUM tape, metal brush. Then follow the instructions:

1. Turn off the boiler, shut off gas and water.
2. Remove heat exchangerusing an adjustable wrench.
3. Clear it with a brush.
4. Through the pipe pour over into the heat exchanger acid solution... If foam appears, it means there is a lot of scale inside.
5. Pour out solution and repeat procedure.
6. Rinse.
7. Install back, beforehand wrapping all threaded connections with FUM tape.

Problems usually arise with combustion electrode. If the flame of the burner goes out after a few seconds, and the boiler gives an error, then the problem is in the combustion sensor. We turn off the boiler, turn off the gas.

To repair the electrode, you will need sandpaperwith the help of which the probe probes are cleanedwithout removing it. If the breakage remains, the sensor changes.

Exists two problemsthat lead to spontaneous boiler shutdown. The combustion sensor is broken or chimney clogged... The repair of both faults is described above in the article.

Watch the video, which tells about the malfunctions that occur during the operation of the boiler.

Most boiler breakdowns are repaired on their own, but this does not mean that you need to neglect the help of a specialist. Gas equipment is potentially life-threatening.

And also do not forget about maintenance... Cleaning the heat exchanger and chimney will save you from possible breakdowns.

How Junkers gas boilers are serviced: repair of the Thermo, Novatherm and Keraklass series, consideration of the causes of breakdowns and the peculiarities of their elimination

Despite the fact that Junkers carefully monitors the quality of its products, gas boilers of their production can also fail over time. It is preferable to repair malfunctions in such heating devices with the hands of specialists. However, if you take into account the causes and nature of the breakdown, you can fix the boiler operation yourself.

Boiler device Junkers ZW

The reasons that can disable Junkers gas boilers can be explained by external factors:

• intermittent power supply;
• low gas pressure in the system;
• clogged ventilation;
• in poor water quality in the tap.

A troubleshooting technology is selected based on the severity and possible damage to the entire unit. This can be as a cosmetic repair associated with the coating of water and gas pressure pipes with paint or anti-corrosion compounds, preventive, associated with routine cleaning or replacement of some component parts, as well as major troubleshooting measures that may be caused by a violation during installation or in the process. exploitation.

Among the elements that are most susceptible to failure under the influence of external factors, one can single out:

• gas burner;
• electronic board;
• circulation pump.

Repair or cleaning of the burner is necessary if the following malfunctions occur:

• lack of spark;
• the spark goes in the wrong place;
• the spark passes, but the flame does not ignite;
• the flame goes out after releasing the ignition button;
• the water temperature does not correspond to the set one;
• there is noise during the operation of the burner (hissing, loud popping).

In this case, the causes of violations may be the presence of air or moisture in the diesel filling, violation of pumping pressure, malfunction of the shutter valve, as well as untimely cleaning of ventilation openings (chimneys or mesh filters).

Burner device in the Junkers Mora boiler

For example, floor-standing gas boilers Junkers of the Thermo series are distinguished by the fact that the air flow into the combustion chamber is organized from below. Also at the bottom of the chamber there is a filtration mesh. Over time, dust collects on it and, as a result, a dense layer of small particles does not allow air to pass to the firebox or, on the contrary, accumulates in the chamber. Because of this, when the boiler is turned on from the main burner, air detonation can occur, and, as a result, a loud pop. As a result, the flame will be maintained only in the igniter and therefore the water heating temperature may differ from the one set in the settings. Repair, in this case, is very easy to carry out, simply by removing dust from the filter.

All Junkers floor-standing and wall-mounted heating boilers are equipped with an electronic control and monitoring board for equipment operation. This part is very sensitive to any kind of stress that can be caused by:

• voltage drops in the network;
• accumulation of static charge, which increases in thunderstorm weather;
• incorrectly selected temperature mode of the optional settings.

So, for example, Junkers OW23AE double-circuit gas boilers sometimes, when switched on in heating or water heating mode, do not produce a spark on the burner. The reset buttons and indicators start flashing. This indicates a malfunction of the board and can lead to a short circuit and malfunction:

• air duct fan;
• differential pressure switch;
• NTC sensors for direct hot water pipelines.

The layout of the board sensors for the Junkers Euroline series (used when detecting stuck contacts on the relay)

Repairing the board is very expensive and is carried out only by professionals, therefore, in the event of a failure, it is recommended to purchase a new electronic circuit in company stores, which, as a result, also costs a lot. Therefore, it is recommended to monitor the operation of the boiler and its sensors during the entire operation of the device:

• timely clean the coolants;
• monitor the grounding of the case;
• install voltage stabilizers.

A common cause of malfunctions can be the contamination of the boiler furnace chamber and the presence of a large amount of soot in it, which may be associated with the poor quality of natural gas. The breakdown indicator is uneven heating of the coolant, incomplete combustion of the gas, the impossibility of heating the water above 45 degrees Celsius, since the coolant overheating sensor is triggered. Such a failure can be observed in the Junkers Ceraclass series.

Preventive maintenance to eliminate contamination includes the following stages of work:

All valves must be closed before starting work.

• remove the front covers, disconnect the wire leading to the piezoelectric element;
• relieve the pressure of the water in the boiler by turning on the water tap and letting the water drain into the sink;
• check the gas pressure by connecting a pressure gauge to the gas valve fitting;
• unscrew the thermocouple, ignition electrode, burner tube;
• replace the old gasket under the pilot burner with a new one;
• remove the nozzle and flue;
• brush the swirlers, base and outside of the heat exchanger;
• blow out the inside of the heat exchanger with a vacuum cleaner;
• process the burner itself with a brush and a brush;
• wipe the gas duct on all sides with a rag;
• brush the outer part of the nozzle, and use a thin needle to clean the hole;
• assemble the elements in the reverse order, trying not to confuse their locations and not to violate the integrity.

How to repair gas boilers of the Junkers Novatherm ZW20KE series, in which there is also a problem of water heating, can be found in the video below.