Vaillant boiler error f22 - How to fix error f22 gas boiler Vaillant (Vailant)

How to fix error f28 of a Vaillant gas boiler (Vailant)

1. Display of the current filling pressure of the heating system, heating flow temperature or display of a status code or error.
2. Green indicator lamp for hot water is off: No hot water is being collected. Flashing: Hot water is being collected. 3. Yellow indicator lamp lights up continuously: Burner on. 4. Red indicator lamp lights up continuously: The device is in a fault state and an error code is displayed. German heating systems are available in various modifications. But regardless of the principle of operation or design features of gas boilers, error f28 is typical for all versions of Vaillant, and the reasons that initiate it are identical. Most of them are identified and eliminated on their own, without calling a specialist. The article will help you troubleshoot possible problems and give recommendations on how to restore the functionality of your equipment.

Error interpretation

Code f28 appears on the display after several unsuccessful ignition attempts. The reasons can be divided into four groups:

Successful attempt to ignite the vaillant boiler

• “blue fuel” does not reach Vaillant;
• the pressure in the pipe is below a critical value, the gas fittings of the boiler do not operate, and the electronics display error f28;
• problems with the supply voltage or grounding elements;
• Problems with the Vaillant boiler.

Understanding this and knowing the specifics of the gas supply to the facility, it is easy to develop an action plan for troubleshooting. In order to reduce the time to eliminate the f28 Vaillant error, you need to start by testing the most problematic areas of the circuit.

Video about how error code F28 is displayed on the Vailant boiler.

“Troubleshooting” button to reset certain faults. Click it.

First steps

• Perform a reset . There is a corresponding button on the panel of Vaillant gas boilers (crossed out flame symbol or REZET designation). If error f28 is caused by a failure in the electrical network, the problem is eliminated.
• Check power supply . It is enough to turn on the lighting to understand from the light bulbs in the house whether the voltage is normal or has dropped. In the absence of a stabilizer for the Vailant boiler at sites in areas of mass construction, this is one of the likely reasons for the appearance of error f28.
• Make sure the grounding is reliable . Loose contact or broken wire: it won’t take much time to check and eliminate the defect.

On a note!

The recommendation to “turn the plug over” and reinsert it into the socket in order to eliminate the error is not suitable for Vaillant boilers - the experiment will lead to the circuit breaker turning off or the electronic board burning out.

Gas path diagnostics

When connecting a building to a main pipe

If we are talking about a residential building, and “blue fuel” is chosen as the main energy resource, in the house, in addition to Vaillant, there is a gas stove. After the pipes have been laid, there are no devices in the section of the circuit up to the boiler. Therefore, you can control the flow of gas without leaving the kitchen.

The check comes down to igniting all the burners on the stove at maximum mode. Flames with a characteristic shade will indicate the absence of problems with the fuel supply, and their intensity and stability will indicate the constancy of the pressure and its normal value. If the stove does not light up or does not work correctly, you need to look for a fault in the section between the main line and the place where the gas pipes are laid (the method is described below).

With autonomous gas supply

Check what

• Shut-off valve . If the Vailant boiler is taken out of service at the end of the heating season, the owner of the property, as a rule, blocks the main line and then forgets about it. Perhaps it is the gas valve that is causing the f28 Vaillant error.
• Shut-off valve . Triggered when the voltage is turned off; A “normally closed” type device is installed on the gas pipeline. It must be moved to the working position manually.
• Gearbox . Insufficient insulation of the head of a gas tank or an outdoor cabinet with a cylinder group causes icing of this device - the pipeline is blocked. Contamination of the channel is reflected in the pressure - when its value is below the response threshold of the gas valve of the Vaillant boiler, error f28 appears.
• Filling the tank . As the “blue fuel” is consumed, the pressure in the pipe also gradually drops. The most typical case of error f28. The igniter fires, the Vailant boiler starts, but the burner goes out. And so several times, as if she was missing something. Namely, normal gas flow.

Another option is the formation of an ice jam on one of the sections of the highway outside the building. But this defect must be dealt with (and eliminated) by specialists.

Diagnostics Vaillant

Ionization sensor

If ignition occurs (there is a spark), but after a short time error f28 appears and the operation of the Vaillant boiler is blocked, the electrode “does not see” the flame.

• Signal circuits . A wire break or short circuit to the housing is possible - such defects are easy to detect visually. You should also check the reliability of the contact at the connection point on the Vaillant electronic board. Oxidation of the plug lamella and loose fit in the connector lead to a break in the signal circuit and the appearance of fault code f28.
• Electrode (located on the left side of the assembly). Its contamination with soot and burnt dust is another most likely cause of the f28 Vaillant error. Sometimes it’s enough to wipe it with your fingers and the boiler’s operation is restored. If the electrode has not been serviced for a long time, you need to clean the tip of the wire with a fine abrasive (00 sandpaper).

Burnt ignition electrode of Vaillant boiler

New Vaillant boiler ignition electrode

Ignition system

Its serviceability can be judged by the spark between the igniter electrodes. If the connected wires are in normal condition and the assembly body is intact (the absence of cracks is determined visually), the cause of error f28 of the Vaillant boiler is in the transformer. It is necessary to test its winding to identify a break: the multimeter should show ∞.

Coil location in Vaillant boiler

Modulation coil for the gas valve of the Vaillant boiler

Gas valve

It is not difficult to disassemble it yourself: you will need an asterisk key. After dismantling the stepper motor and removing the cap, the rod is visible. It is “responsible” for moving the membrane that regulates the gas supply to the burner of the Vaillant boiler. During operation, it becomes dirty, and layers interfere with its free movement. It is enough to wash it in any alcohol-based liquid, put it in place and reassemble in the reverse order.

Vaillant boiler gas valve

Location of the main units in the Vaillant boiler

This is a theory, but in practice everything is much more complicated.

What are the pitfalls?

• Vaillant connectors have miniature latches. Users often break them when removing the valve from the boiler.
• A special lubricant is applied to the rod. Which one exactly is not an idle question.
• You can reset the Vaillant fittings based on the gas pressure at the inlet to the boiler burner.
• Self-service of the valve will eliminate error f28, but where is the guarantee that after installing the unit in place there will be no gas leakage? It will not be detected immediately, and if the Vailant boiler is installed in a separate room, which can result from the accumulation of “blue fuel” in the enclosed space of the room, there is no need to comment. There is something to think about even for those who are used to saving on everything, even on personal safety.

Other reasons for the error

• Gas meter and pressure meter (if installed). In the event of a breakdown, the gas pipeline is blocked, which initiates code f28 on the Vaillant boiler display. The metering device is sealed: to check its functionality, you need to call a representative of the resource supply organization.
• Electronic board Vaillant. It is replaced on site with a working one - searching and eliminating the defect is possible only in a hospital (workshop) environment.

Useful tips

1. In any locality there are several organizations specializing in the maintenance/repair of heating equipment. If you cannot resolve the gas boiler error yourself, you need to choose a service certified by the Vaillant manufacturer. It contains everything necessary for diagnosing the unit: guidelines, diagrams, appropriate instruments, spare parts (and at the factory price). Calling an employee from a “wide-profile” workshop may delay the repair in time, and the cost of the work will be much higher.

• Vaillant gas boilers are sensitive to “surprises” of the supply network. But purchasing a stabilizer does not completely solve the problem. For the private sector, especially suburban properties, it is advisable to connect Vaillant via a UPS. The unit is multifunctional, since in addition to the stabilization circuit, it contains a charger and a battery group. In the event of a break in the line, in the event of a failure of the backup generator or difficulties in starting it during cold weather, it will ensure the operation of the Vailant boiler for several hours.

• After eliminating error f28, it is recommended to immediately clean the lower part of the heat exchanger housing and the Vaillant chamber. A vacuum cleaner and a toothbrush are all you need. During the operation of heating equipment, dust accumulates inside the boiler, the efficiency of heat transfer decreases, and the outflow of hot air worsens. As a result, gas consumption increases (and this increases the cost of heating the facility) and the risk of thermal deformation of the electronic board (banal overheating).

If you have experience on how to fix error f28 of a Vaillant boiler or what needs to be done based on your experience, write in the comments to this article, we will try to consider your option and analyze it in detail in this article or one of the following articles. You can also send photos and videos with comments and descriptions.

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How to fix error F29 of a Vaillant gas boiler (Vailant)

When following the manufacturer's recommendations for the installation and operation of household heating systems, they rarely fail. According to repair statistics, some problems are a consequence of illiterate user actions or the influence of external factors. This article will help you resolve error f29 yourself.

Decoding the code

Error f29 appears while Vaillant is running. It is confused with the 28th, the code of which indicates unsuccessful attempts at ignition. There is no point in immediately dealing with the boiler or calling a technician if the equipment is under warranty. The malfunction is a consequence of a short-term interruption in the gas supply.

First steps

• Restarting the boiler . Depending on the Vailant model, the reset button on the front panel in the instructions is designated “Power switch”, “OK”. If error f29 is caused by a momentary failure of the supply voltage, it will disappear.

Press button number 8 on the Vaillant boiler control panel

• Grounding check . Incorrect connection, unreliable contact, damage to the house circuit: the functioning of other household appliances will not be affected, but the Vailant electronics will react.
• Inspection of the shut-off valve. This protection element is installed on the gas pipe and blocks it in the event of a short-term power failure. In everyday life, devices of the “normally closed” type are used: when the valve is activated, manually cock it. “Blue fuel” will begin to flow to the Vaillant boiler, error f29 will disappear.

This algorithm of actions saves time in troubleshooting problems with heating equipment. A negative result is a reason to look for the reason for the shutdown of the Vailant boiler.

On a note! The instructions for gas equipment contain scant information on faults. The manufacturer, taking into account the complexity of the devices and their danger in terms of ignition (explosion), does not rely on repairs by the user - only a certified technician. A number of Vailant boiler errors are caused by identical factors.

Check what

Gas main

Blockage of the path, pressure drop cause error f29. In a facility with a gas stove, it can be used to test the system by igniting all burners. Based on the height of the flames, their stability, and color, it is easy to determine whether “blue fuel” is flowing through the pipe, whether the pressure is reduced, or whether air is leaking.

Simple gas flow check

The stove consumes more gas when igniting than Vaillant. In practice, after turning it on, the boiler error f29 disappears. If this is observed, the reason is in the counter. Its mechanical part sometimes jams, and increased fuel consumption contributes to a “breakdown”: the meter will have to be changed.

Probable Causes

• Interruptions in the supply of energy resources. With autonomous gas supply, error f29 is a consequence of the depletion of “blue fuel” reserves in the tank or icing of the gearbox.
• Gas filter . Needs periodic maintenance. The smallest fractions applied through the pipe, ice particles gradually clog the cells. The pressure decreases, the Vaillant boiler begins to malfunction and stops with error f29.
• Counter . Incorrect operation causes the unit to stop. It is easy to control by observing the dial (scoreboard).

Air supply channel

The procedure is determined by the specific installation of the heating installation.

• When air is taken from the room, an intensive inflow is ensured. The method depends on local conditions: for example, the furnace door swings open. If the hood is running in the adjacent room from which oxygen is taken for the Vailant boiler, it is turned off. These simple steps eliminate error f29. Next, it is decided what to do to effectively supply air to the unit under all conditions.

• When the channel is brought out, the head is checked. To prevent dust and small debris from entering the boiler, a mesh is placed on the pipe. Some craftsmen put on a tin can with holes. The filter cells become overgrown with dust and ice, and oxygen reaches Vaillant in a smaller volume. This affects the ratio of the components of the combustible mixture, the flame becomes unstable, sometimes goes out, and the boiler operation is blocked with error f29.

Coaxial chimney with protection from the external environment
Recommendation . If code 29 appears during periods of change in wind direction, you should change the air duct laying scheme: take the pipe to a different place, cover the head - there are many options. The main thing is that it doesn’t blow.

• Condensate removal channel. For normal operation of the Vailant boiler, the accumulated liquid must be drained periodically. Failure to follow this recommendation may cause error f29.

Ionization sensor

Provides a signal to the Vailant boiler control module about the presence and stability of the flame. As a result of partial contamination (carbon deposits, dust), the electrode loses sensitivity. Error f29 can be eliminated by cleaning the wire.

Clean the Vaillant boiler

When repairing a Vailant boiler, the integrity of the signal circuits is checked. The harness is disassembled, but at the end of the work the tie is not put back in place. It is possible that the ionization sensor wire is adjacent to a metal part and, when the insulation is worn out, periodically shorts out. Hence the error f29.

Gas valve

It must be taken into account that it is adjusted by pressure. Therefore, with error f29, no disassembly of the fittings or adjustments are carried out, only cleaning. After dismantling the Vailant boiler assembly, remove the cap covering the damper control rod. It is electromechanical, movement is provided by a magnet. The smallest fractions, clogging the gap between it and the gasket, prevent the free movement of the rod. The entire cavity to which there is access is also cleaned. Removing dirt and dust eliminates error f29.

Vaillant boiler gas valve

It is also caused by mechanical damage. A typical malfunction is a defect in the gearbox: the unit is replaced.

Ignition transformer

Failure to start the Vailant boiler is due to the lack of a spark or its insufficient power. If there are no wire defects, the Tr winding is checked with a multimeter: open – R = ∞, short circuit – R = 0. With interturn, the device will show resistance, but if the value does not correspond to the passport data, the spark is weak, insufficient to ignite the burner. Error f29 can be eliminated by replacing the transformer.

Burnt ignition electrode of Vaillant boiler

Control board

Self-repair is possible for a user with specialized education, but it will take time. Error f29 can be eliminated by replacing the Vaillant boiler assembly.

Useful tips

• With an autonomous gas supply, before the start of the cold season, it is advisable to update the thermal insulation of the outdoor cabinet with cylinders and the head of the gas tank. It is naive to hope that insulation lasts forever.
• Connect the Vailant boiler to the network via a UPS. Some errors are caused by voltage problems. The stabilizer helps, but as long as there is no break in the line. The power supply is capable of providing autonomous operation of Vailant for several hours: enough to eliminate a power line failure or problems with a backup power source. The UPS includes a stabilization circuit, a group of batteries, and a charger.
• Clean the heat exchanger housing periodically. Dust accumulation is the cause of error f29. A layer is formed through which combustion products do not completely pass through the fins of the device into the chimney. Partial flow of thermal energy is redirected inside Vailant. In addition to reducing the efficiency of the unit, the temperature under the casing increases. The result is melting of the insulation, deformation of the electronic board, periodic occurrence of errors with an emergency stop of the boiler.

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Ignition transformer

Failure to start the Vailant boiler is due to the lack of a spark or its insufficient power. If there are no wire defects, the Tr winding is checked with a multimeter: open – R = ∞, short circuit – R = 0. With interturn, the device will show resistance, but if the value does not correspond to the passport data, the spark is weak, insufficient to ignite the burner. Error f29 can be eliminated by replacing the transformer.

Burnt ignition electrode of Vaillant boiler

Control board

Self-repair is possible for a user with specialized education, but it will take time. Error f29 can be eliminated by replacing the Vaillant boiler assembly.

Useful tips

• With an autonomous gas supply, before the start of the cold season, it is advisable to update the thermal insulation of the outdoor cabinet with cylinders and the head of the gas tank. It is naive to hope that insulation lasts forever.
• Connect the Vailant boiler to the network via a UPS. Some errors are caused by voltage problems. The stabilizer helps, but as long as there is no break in the line. The power supply is capable of providing autonomous operation of Vailant for several hours: enough to eliminate a power line failure or problems with a backup power source. The UPS includes a stabilization circuit, a group of batteries, and a charger.
• Clean the heat exchanger housing periodically. Dust accumulation is the cause of error f29. A layer is formed through which combustion products do not completely pass through the fins of the device into the chimney. Partial flow of thermal energy is redirected inside Vailant. In addition to reducing the efficiency of the unit, the temperature under the casing increases. The result is melting of the insulation, deformation of the electronic board, periodic occurrence of errors with an emergency stop of the boiler.

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What to do with error F20 on a Vaillant gas boiler (Vailant)

The diagnostic function of heating installations in automatic mode allows the user to solve almost all problems without contacting service. For Vaillant gas boilers, error f20 is a rare occurrence. Understanding the reasons why it is caused, it is easy to identify the problem and fix it on your own.

Decoding the code

Recommendations for eliminating the f20 Vaillant error found on forums and thematic sites are different. It appears when the boiler overheats, and there are several reasons for this. The nuance is that the instructions indicate different codes for them: f0 (high supply temperature), f22 (sharp drop in coolant pressure) and a number of others.

Error f20 is displayed on the control panel of the Vaillant boiler

Not everyone understands the difference between Vaillant boiler sensors. Devices installed on the forward and return lines monitor the current temperature. The overheating thermostat is activated at a value of t˃ 95 0C at the output of the heat exchanger and turns off the heating installation upon an alarm signal with error f20. Therefore, it is necessary to deal with it.

Procedure

Step 1

Perform a reset by pressing the button on the Vaillant control panel. Imported boilers are sensitive to the supply voltage, and if the network is unstable, they malfunction with an indication of some error. If it is false, it is easily reset.

Button
8 “Troubleshooting” for resetting specific faults

Step 2

Bring the thermostat into working position. In Vaillant boilers, it is “cocked” manually by pressing the rod (painted red). If error f20 is caused by a pump malfunction or other reason, it will disappear. To access the overheating thermostat, you need to fold back the front panel - in most Vaillant models, a protective device (fuse) is installed at the heat exchanger outlet, under the NTC sensor.

Location of the NTC sensor of the Vailant boiler

Step 3 – diagnostics of signal circuits. Defects are determined visually: line break, insulation melting, short circuit - the causes of error f20 and emergency stop of the Vaillant boiler. The reliability of the contacts and the absence of oxides are checked.

Step 4 – testing the overheat sensor. It is easy to determine serviceability with a multimeter by measuring the resistance. In the initial state, the contacts of the working device are closed, R = 0. The protective thermostat cannot be repaired - it is replaced.

The last reason that causes error f20 is the electronic board of the Vaillant boiler. It generates a fault code based on a signal from the overheating sensor. It will not be possible to identify a defect on your own without diagrams, experience, or appropriate equipment. If the measures taken to eliminate error f20 are unsuccessful, you need to contact a service center. After replacing the board, the boiler's performance will be restored.

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Error f33 vaillant how to fix and what to do?

Occurs only in turbocharged boiler models. The source of the error is the pressure switch in the exhaust pipe. The operating logic of all modern gas boilers is approximately the same. When a request for ignition is received, the control board turns on the fan (smoke exhauster), which creates a vacuum. When the required draft is achieved, the contacts of the differential relay close and thereby transmit a signal to the board to open the gas valve and ignite the burner. Accordingly, if there is no signal from the relay or it is in a closed state after the fan is turned off, the vaillant automation generates error f33.

Vaillant boiler error f33

causes:

• The fan does not work (can be checked visually)
• breakdown of the pressure switch (condensation may accumulate in the tubes, which, flowing into the sensor, renders it unusable;
• error when installing the exhaust pipe (condensation can also accumulate and flood the relay)
• clogging of coaxial pipelines, preventing normal air flow
• pitot tube clogged (accumulated dirt or insects)

You can check the operation of the relay by creating a vacuum yourself through the tube (a characteristic click should occur). It happens that the relay “sticks”, i.e. in normal condition it will be closed, which can be checked with a conventional multimeter. In this case, it will have to be replaced.

It happens that the tubes themselves or the pitot tube are damaged, for example, from exposure to high temperatures.

The slightest change in shape can affect the readings and cause error F33.

It is worth noting that this is a problem with almost all gas boilers. Some manufacturers solve this by installing a special extension (this is what BAXI did) to collect condensate, and some even make heated tubes to evaporate it.

Vaillant Error Codes

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