Vaillant boiler: error f33. Vaillant error codes - troubleshooting recommendations

European] Vaillant[/anchor] is well known to specialists and users of heating equipment.

Founded more than 100 years ago, the company has accumulated vast production and technological experience and has developed a lot of its own patented components and parts.

Gas boilers manufactured by this company are known far beyond Europe and are exported not only to Russia, but also to most countries of the world.

The units are famous for their reliability and resistance to external loads, and are adapted to the technical conditions of the country where they will be used.

Emerging problems are immediately diagnosed by a system of sensors that send a signal to the display about the occurrence of a particular problem.

Let's take a closer look at this issue.

Gas boiler Vailant: operating instructions

At the same time, double-circuit boilers do not operate in heating and water heating modes. By default they work for heating. But when the hot water tap opens, the boiler switches to heating mode. It is worth knowing that water is heated in limited quantities - for domestic needs. The boiler switches to heating mode automatically after the hot water tap is closed.

Experts strongly do not recommend installing a double-circuit wall-mounted gas boiler Vailant yourself. Errors in installation will lead to the fact that it will not meet your expectations. Most of the complaints made by users are based on improper operation and errors during installation. Problems can occur due to poor quality of gas and energy supply, which is not uncommon in our country.

If you are using a Vailant gas boiler, the instructions for it are very simple and understandable; each malfunction or malfunction is indicated by a specific code that is displayed on the control panel monitor. Some problems can be fixed on your own, while others will require calling a professional.

Advantages

Thanks to the symbiosis of tradition and modern technology, Vailant heating boilers have received a number of advantageous qualities.

Advantages:

quality confirmed by certificates and international awards;
silent operation of installations;
energy efficiency of 91% and higher (Vaillant condensing boiler has an efficiency of up to 109% compared to a traditional one);
environmental friendliness (reduced emissions into the atmosphere);
safety through the use of advanced automation: control of pressure, pump and other elements;
protection against freezing and jamming;
systematic - the ideal compatibility of Vaillant devices with each other allows them to be assembled into a single effective system of any scale;
discreet, laconic design will fit into any interior;
developed network of service centers;
simple installation and maintenance;
comfortable control using a controller or mobile application.

Flaws

The main disadvantage of Vailant equipment is its high cost compared to similar domestic and imported equipment.

What do the error codes mean?

In many cases, there is no need to disassemble the device yourself or guess what the problem is. Error codes provide all the necessary information to the consumer. But you definitely need to know them. A symbol starting with S indicates a certain status of the device. And codes starting with F indicate certain failures.

When you see this or that conditioned signal for the first time, you should not be afraid. You need to try rebooting the electronics. Only when the same code appears again do you need to take special measures. F0, as well as F71, indicates that the circuit supplying the thermal sensor that measures the temperature of the coolant is broken.

You need to find out things like:

Is the sensor itself operational?
is the plug contact good?
Is the wiring reliable?

F1 demonstrates that the temperature meter on the return line has broken. F2 says that the thermal fill sensor is malfunctioning. When the F3 signal appears, it is easy to understand that the circuit of the same sensor, but already responsible for controlling the drive, is damaged. Error F5 can only be seen in Atmo wall-mounted boilers, and it means that the connection with the external smoke removal indicator has disappeared. Code #6 states that there is a problem with the wiring of the internal sensor located in the tap.

Using code No. 10, specialists identify short circuits in the supply thermistors. F11, F13 show the same status, but only for the return thermistor and hot start measuring device respectively. A closed external detector for gaseous products is characterized by two errors at once - F15 and F16. Code F20 indicates that the system is malfunctioning due to excessive heating. But F22 talks about another point - there is not enough water. A similar picture is indicated by code F23, which is often associated with malfunction of sensors, pumps, or low performance.

Signal No. 24 indicates that not only the coolant level has decreased, but its heating has also increased significantly and the pressure has decreased. F26 means that there is a failure in the gas fittings. You should also suspect an error in connecting the servomotor. F27 is displayed if a flame is detected when the fuel valve is closed. More serious than F28, this code appears when it is impossible to start the burner.

You will have to control the meter, fittings, pressure measuring relay, and the main module.

F29 is displayed when the fire goes out due to interruptions in the gas supply. All that remains is to wait for his approach to be restored. If the wait is prolonged, you will have to contact the service responsible for the supply of blue fuel. It is also useful to check whether the boiler is properly grounded. Only in condensing boilers does error F32, F37 occur. It reports that the fan does not rotate as it should at a particular moment (other models demonstrate this with code F38).

The TurboTEC model has a special error not found in other devices - No. 33. It is easy to find out from it that the relay that measures the pressure does not work. The F36 signal arrives when the draft meter detects its weakness and the penetration of combustion gases into the boiler room. And F42 is displayed if the resistor responsible for conditional coding has broken down. When signal No. 49 arrives, you need to check the status of the eBus information bus.

Code 53 indicates an incorrect setting of the combustion process. At signal 54, you need to start eliminating malfunctions in the fuel supply, in this case it is worth sequentially opening the valve, increasing the pressure and visually assessing the serviceability of the shut-off valves. Code 56 indicates a malfunction of the main parts of the fuel burning unit. If connecting the plug does not solve the problem, you need to check the fittings. And code 57 is issued when setting the “Comfort” mode with an incorrect adjustment. It is also worth suspecting that the ignition electrode has become corroded.

If the cleaned parts continue to perform poorly, you will have to install a completely new part.

F61 may illustrate either a shorted cable, an open circuit, or a fuel valve failure. The signal F62 determines the delayed shutdown of the valve caused by poor response of the control electrode. The display of the number 63 indicates a so-called EEPROM failure, which can only be repaired by service centers. Violations shown by numbers 64 and 67 indicate that the electronic “stuffing” of the boiler is damaged or the sensors have gone wrong. A relatively minor problem is error 70, which occurs when the step of entering the code for a new boiler is skipped after installing a replacement display and electronic components.

The F72 index allows you to recognize violations in the thermal line sensors responsible for the supply or located on the return circuit. F75, as it were, notifies the boiler owners that even starting the pump does not help raise the pressure. You will have to release the air accumulated in the system, adjust the settings of the bypasses and expansion tanks. F35 is a kind of “partner” of the 36th error.

This error appears when the following malfunctions occur:

if the air or gas outlet is blocked;
when, due to weather conditions or due to structural defects, traction is impaired;
with abnormal ventilation;
when the boiler room overheats;
if the boiler is too close to the wall.

F76 lights up on the display when the primary heatsink is too hot. And F77 indicates that the diverter valve or pump responsible for condensation is working too poorly. F51 signals about the overturning of the draft and obviously incorrect operation of the chimney. Simultaneously appearing signals 80 and 91 immediately indicate a short circuit in the secondary radiator sensor. If errors 81 and 91 are combined, there is a malfunction of the loading pump.

You can fix this error by doing the following:

release air;
check for violations of cables, sensors and impellers;
Find out if the heat exchanger is dirty and clean it if necessary.

F83 notifies about an incorrect measurement made by thermistors on the receiving and return lines. Simply add coolant or adjust the placement of the thermistor. Codes 84 and 85 also indicate incorrect information from thermistors, but problems need to be resolved differently - by swapping blocks or eliminating other installation defects. Deformation F93 demonstrates that combustion is not occurring properly. When cleaning the Venturi nozzle does not help, you need to change the nozzle to a more correct device. The Con defect indicates that the exchange of information with the control equipment is disrupted and you will have to contact a service organization.

The Fxx code talks about software failures; 5ER is not so much an error in the usual sense of the word as a reminder of the need for maintenance.

Vaillant boilers can also produce intermediate messages that are not errors. Thus, S0–S8 tell consumers about the running heating mode. When the boiler prepares hot water, signals S10–S17 are shown on the display.

Other status signs are as follows:

30 – external thermostat blocked heating;
31 – the system has been switched to summer format and cannot heat the house;
33 – frost protection is working, the system is blocked for 1/3 hour.

It happens that the heating seems to be running, but the regulator instructs the boiler to operate at +20 degrees. In this case, signal 36 is displayed on the screen. But code 41 says that the nominal pressure is developing too high inside. S42 can be displayed when the burner is not working, when the valve on the outlet is triggered or the condensation pump is damaged. S51 is a condition where combustion gases enter the room.

Error 53 is detected when there is a lack of water. The boiler will correct the situation or wait for help from the owner in this within 150 seconds. S54 means the system waits for 20 minutes for action. There is no cause for alarm when status S98, 96 or 97 appears, since these are signs of operation in test mode.

The occurrence of all of these problems can be minimized by promptly inspecting the boiler and carrying out maintenance.

Everything you need to know if malfunctions occur with Vailant gas boilers

Gas heating equipment today is most popular in both private homes and apartment buildings. There are quite a lot of manufacturers producing high-quality gas boilers, including the German company Vaillant.

Main characteristics of Vailant products

The Vaillant company produces condensing equipment, gas heaters and gas boilers, both floor-mounted and wall-mounted. The range of boilers is quite large; they are manufactured with one and two circuits. Double-circuit ones are the most common due to their function not only to heat the room, but also to provide hot water supply.

Any double-circuit gas boiler produced by Vailant has the following advantages:

It is light in weight and quite compact;
Easy to use and safe;
Has a large power range;
High quality, reliable and durable;
Its installation will not take much effort;
Has a modern design and control system;
It heats the room perfectly and is quite economical.

In addition, each boiler has built-in safety sensors, mostly 3, but in some models there may be more. The first sensor shuts off the gas if the flame suddenly goes out, the second ensures the safe removal of combustion products, and the third controls the temperature regime inside the unit. Each device is also equipped with three lights with different colors on the control panel. The green light is on when the unit is heating water, the yellow light indicates the operation of the gas in the boiler, and the red light indicates any problems.

Despite the high quality and a lot of advantages, there are also disadvantages, among which stand out:

We are dependent on electricity;
There is no expansion tank;
The high price of both the device itself and its components;
There is no way to close the control panel, which is not safe if there are children in the house.

The most common malfunctions and their causes

Despite true German quality, like any other equipment, Vailant boilers are subject to various types of failures. If this or that problem does arise, the device informs the owner about it by displaying an alphanumeric code on the LCD display, including a red light, as mentioned above. Each error has its own code.

If you study thematic forums where boiler owners discuss their malfunctions, the most popular queries are:

error with code F22, indicating the absence of water in the device or its shortage. It is worth checking whether the pump is jammed, whether the pump cables are securely connected to the water pressure sensor, look at the sensor itself or at the power of the pump. Possible still weak water circulation;
error with code F28, in which the unit does not start at all. The reasons may be different: the zero and phase are incorrectly connected, the gas is oversaturated with air, the gas pressure level is too low, the control board is broken, the boiler is not properly grounded, a cable break or an error in connecting to the gas pipeline. Some problems can be solved by yourself by looking at the instruction manual. For example, check whether the gas tap is open or change the gas pressure in the boiler settings to 5 mbar;
error with code F29, in which the burner flame constantly goes out, and new attempts to ignite are unsuccessful. The reasons may be: the gas boiler is not grounded correctly, gas supply failures in the gas system itself, problems with the ignition transformer or gas valve. To eliminate this problem, it is worth checking the gas pressure; it may drop too low or see if there is enough air for normal combustion of the fuel;
error with code F36 (Vailant Atmo), in which combustion products come out. This problem may occur due to poor ventilation in the room or poor draft in the chimney, or the temperature in the room is too high. You should also check whether there is sufficient space between the boiler and the wall;
error with code F75, in which the boiler pump works, but the pressure does not rise. There may also be several reasons: breakdown of the pump or water pressure sensor, air getting into the heating system, incorrect connection of the expansion tank or insufficient water pressure. To fix the problem, you can try cleaning the water pressure sensor or you will have to purchase more powerful components.

Possible malfunctions that do not happen so often

If the required error code is not in this list, this means that only a specialist can handle it.

F0, F A breakdown occurred in the NTC sensor that controls the temperature on the flow line (F0) or return line (F1). It is necessary to check not only the sensor, but also its cable;
F2, F3, F The NTC sensor has malfunctioned. Perhaps the plug is inserted poorly or the sensor or cable itself is broken;
F5, F6 (Vailant Atmo). There is a problem with the operation of the sensor, which ensures the safe removal of combustion products. You need to check whether it is connected correctly, or whether the failure occurred due to a broken cable or the sensor itself;
F10, F There is a short circuit in the flow (F10) or return (F11) temperature sensor. Check everything described above;
F13, F The temperature in the unit has exceeded 130 degrees, and a short circuit has occurred in the hot start sensor. Check everything described above;
F15, F16 (Vailant Atmo). A short circuit has occurred in the sensor responsible for removing combustion products. Check everything described above;
F The boiler has overheated;
F There is not enough water in the device, and the temperature between the flow and return lines is very different. It is worth checking the connection of sensors on both lines, the functionality of the pump and cable or board;
F The problem is similar to the previous one - not enough coolant. Check everything the same as in step 8;
F The device switched off due to excessively high temperature of the exhaust gases. The NTC sensor, cables and plugs must be checked;
F The boiler reports the presence of a flame, although the valve is closed. The reason may be a problem with the flame sensor or magnetic valves;
F32 (condensing boilers). Fan speed problems. Most likely, the problem is in itself, but you also need to check the board, cable and sensor;
F33 (Vaillant turboTEC). The pressure switch does not close the contact half an hour after the request for heat supply;

Gas Boiler Vaillant turboTEC

F The eBus voltage has dropped. Perhaps there is a short circuit in it or it is heavily overloaded;
F No control signal is sent to the valves. You need to check the valves, cable and board;
F Valve shutdown delay fault. Check if it is leaking gas and if the injectors are clogged;
F The electronics unit has overheated. The reason is either external or due to a faulty unit;
F Low water pressure. Either the problem is in the sensor itself, or there is a short circuit in it;
F High water pressure. The reason is stated above.

How to avoid problems with the Vailant boiler

First of all, before each heating season, you should call specialists for routine maintenance.

You must strictly follow the operating instructions for the device. For example, you need to follow the arrow indicating the pressure in the device - it should be in the middle of the gray strip and under no circumstances go into the red one. Also, the boiler should not operate at its full capacity, as this will cause it to fail faster. Its service life also depends on the quality of the coolant - filters may become clogged. Of course, nothing can be done about the quality of the water, but sometimes you need to check the filters.

Particular attention should be paid to the fact that in no case should you set up or check equipment if you do not have the necessary knowledge and skills, as there is a high risk of damaging the gas boiler or even causing harm to yourself and others. In addition, if the device is under warranty, then if self-diagnosis is unsuccessful, you may lose the opportunity to use the warranty.

Useful tips

In order not to rack your brains over how to resolve error F28 in the Vailant gas boiler, you must carefully study the instructions before starting to operate the device. It is quite simple and intuitive even for a novice user. Additionally, the device is equipped with a special display, which displays all codes with the name of certain problems.

If any error occurs, you must check its number and read the annotation in the instructions. Some of the problems can be fixed on your own, but in most cases only specialized assistance may be required. To avoid troubles, before each heating season, it is recommended to call a technician who can check the boiler for leaks, as well as for proper performance.

Incorrect pressure in the unit is the most common cause of error F28 in the Vailant gas boiler. What to do in this situation? First of all, experts recommend maintaining the pressure level on the middle gray strip of the sensor. If the arrow moves into the red zone, this indicates that the indicator is decreasing very much. This can seriously affect the operation of the system.

Why does blood pressure drop?

The pressure drop in the boiler has a single cause - a coolant leak. If, after several attempts to increase the pressure using the supply valve, no positive results appear, you should look for a leak in the boiler itself or in the heating circuit.

Difficulty may arise if the boiler is a condensing boiler and is connected to a floor heating system.

Finding leaks in such conditions is extremely difficult. It may turn out that the fault is hidden in the discharge valve connected to the sewer system .

The optimal way to search for causes is to consistently eliminate possible causes of leaks, so that ultimately only one, the correct one, remains.

NOTE!

Certain information can be obtained if you try to determine the intensity of the leak and analyze the throughput capacity of the boiler elements involved.

Vaillant boiler: error F28

If we talk about this code, it can indicate several malfunctions at once. For example, the cause of this phenomenon may be a breakdown of the gearbox, which is responsible for gas pressure. The meter could also be faulty.

In some situations, the Vailant gas boiler generates error F28 when the gas is oversaturated with air. It is also necessary to monitor your blood pressure. To change these values, you must check the settings yourself.

Some users accidentally close the gas valve, which can also cause an error. In addition, the cable often breaks. The gas magnet can also fail. Additionally, you need to check the ignition transformer and make sure that there is no carbon deposits inside the system.

Most rarely, this error occurs when there is a breakdown in the control board. Therefore, regardless of whether the 24 kW Vailant boiler or another model produces error F28, it is recommended to check some components and make sure that the unit is being operated in the correct mode.

Pressure is rising

An increase in pressure can be caused by an open make-up tap. This can be determined simply - continuous replenishment sharply reduces the possibility of heating the coolant, causing the outlet temperature to decrease.

At the same time, the valve should operate, releasing excess heating agent pressure into the sewer system . It is possible for the heating agent to boil in the heat exchanger, which also causes an avalanche-like increase in pressure due to a sharp expansion of volume.

Alternatively, the control board may have failed. The issue can be resolved by resetting to the settings made at the factory during manufacture.

Error f 75 in a Vaillant gas boiler - How to fix error f75 in a Vaillant gas boiler (Vailant)

Vaillant gas heating systems are available in various versions. The most popular are wall-mounted double-circuit boilers Vailant VUW of three series: Turbo FIT, TEC Plus and Pro.

Vaillant ecoTECplus control panel
Vaillant ecoTECpro control panel
Vaillant turboFIT control panel

An analysis of the error tables in their instructions shows the identity of the problems that arise, and for the last two models the instructions are common. The article will help you understand the reasons for incorrect operation or stopping of equipment due to an emergency signal and give recommendations for eliminating them.

Vailant boilers are complex equipment equipped with various components, instruments, and electronics. And if we add “gas” ones, then such heating units pose an increased danger in terms of operation. Therefore, self-correction of errors is possible only within reasonable limits.

Next, the codes are deciphered, the reasons for which a competent user can cope with, especially since some of them are caused by external factors, and not by breakdowns of the Vailant boiler. Solving other problems is the job of a professional.

On a note! Vaillant errors during unstable power supply can be initiated by voltage surges. Eliminated by pressing the “Reset” button. If it doesn't help, you need to look for the reason.

Turbi FIT Controls Overview

ECO button
Heating mode button (ON/OFF)
Rotary button (ON/OFF)
Heating mode button (temperature setting)
RESET button
Display (operating mode indication)
DHW mode button (temperature setting)

Electrical engineering is called the science of contacts by practitioners. Errors appearing on the Vailant display are generated by the electronic module of the boiler based on information from the corresponding sensors. Troubleshooting should begin by checking the signal lines. What to look for:

Vaillant boiler contact groups

breaks or oxidation of wires, lamellas of contact groups;
short circuit to the body, to each other;
loose fit of plugs in connector sockets;
damage to the insulating layer.

Repair practice shows that 85% of boiler errors are caused by precisely these reasons. This means they can be easily eliminated.

The instructions for dual-circuit gas Vaillant VUW TEC are taken as a basis. The symbolism of the codes for other boiler models may differ, but the meaning of the errors and their causes are the same. Knowing this, it is not difficult to find and fix the problem, regardless of the version of the heating installation.

*Error codes for the Vailant Turbo FIT series are indicated in parentheses

How to fix error f22 of a Vaillant gas boiler (Vailant)

Modern heating installations eliminate the need for the user to contact a service organization if a problem occurs after the warranty expires, wasting time and wasting money. The reasons causing error f22 of the Vaillant boiler can be eliminated independently. The article tells you what to do in this situation.

Doesn't restart

There are many reasons for failure to restart a boiler. It is almost impossible to name them all, since most problems one way or another lead to the installation being blocked, and restarting becomes impossible until the cause is eliminated. However, some possible reasons can be named immediately.

For example, the power plug in the outlet may be upside down. Vaillant gas boilers are phase dependent, i.e. cannot work when the contacts are rephased . If a reconnection occurs during repair work, starting the unit will no longer be possible.

In addition, it is possible that the injectors become clogged with soot, which stops passing gas in the required quantity, resulting in immediate blocking upon startup.

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 reasons:

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.