The automatic control unit for gas boilers Vaillant is equipped with a self-diagnosis system. This is a set of sensors that continuously send signals to the processor and provide communication with all boiler nodes. If the signal from any sensor disappears or changes, the display shows the code designation of the problem that has occurred, or an error code.
The self-diagnosis system is a useful and often necessary option, which makes it possible to detect dangerous malfunctions and prevent the failure of expensive equipment.
Content
Causes of malfunctions
German equipment is designed for operation under normal conditions. European power quality requirements, water pressure and gas are very strict, and the operating mode of the boiler is designed for the standard indicators of all systems. However, often the state of the networks does not meet the requirements, which immediately affects the operation of the boiler.
The main problematic element is grounding - if the electrode is not connected to the circuit, or is completely absent, the operation of the device becomes impossible.In addition, Vailant boilers are sensitive to supply voltage and react extremely painfully to low (or high) values, fluctuations or supply failures.
Another problematic factor can be the pressure and purity of the gas. If these indicators do not meet the standards, the operation of the boiler will be constantly interrupted by a self-diagnostic system that detects problems in the fuel supply system. Since the gas line poses a considerable danger, the reaction of the control unit can be quite harsh - up to the complete blocking of the boiler.
Basic error codes
An error code is an alphanumeric designation of a problem that has arisen in any part of the structure.
The most common mistakes:
| The code | Decryption |
| F.00-F.01 | No signal from the temperature sensors of the supply and return lines |
| F.02- F.03 | Breakage of drive temperature sensors |
| F.04 | No communication with return temperature sensor |
| F.10 | Direct line overheating (temperature above 130°) |
| F.11 or F.14 | Overheated return water (temperature above 130°) |
| F.22 | Pump failure (dry running) |
| F.23 | Little water |
| F.27 | The flame on the extinguished burner is determined |
| F.28 | Ignition system failure |
| F.29 | Shutdown after three failed ignition attempts when the flame goes out |
| F.35, F.36 | Smoke exhaust system errors, smoke entering the room |
| F.37 | Fan Abnormal Operation |
| F.72 | Errors in the readings of the sensors of the forward and reverse lines |
| F.75 | Insufficient pressure (pump failure) |
| F.76 | Overheating of the heat exchanger (primary) |
The above list shows only the most common errors that appear on the display most often. A complete list can be found in the user manual that comes with the package.It is recommended to keep it at hand so that when an error occurs, you can quickly find the code in the list and determine the malfunction.
Vailant boilers issue not only error codes, but also messages about the current mode of operation. They begin with the Latin letter S, so as not to confuse users. Codes S.0-S.8 indicate the status of the heating mode, while messages S.10-S.17 appear during hot water preparation.
Troubleshooting
Most sensors of the self-diagnosis system are thermistors that are triggered by changes in control parameters. Often there are situations when small fluctuations in pressure or temperature cause a false alarm of a sensor that gives a command to turn off or block.
Troubleshooting
Therefore, the first action of the user when an error is detected on the display should be a reset (on different models it is performed in its own ways, the user manual has detailed explanations on this topic). If after several attempts (usually they try to reset the code three times) no positive results are obtained, they proceed to more serious actions.
In each case, you must perform a certain sequence of actions:
- clarify the meaning of the error code in the instructions;
- find the problem node (part, element) in the boiler design;
- decide on the method of repair (refurbishment or complete replacement);
- immediate repair.
In some cases, restoration of individual structural elements of a particular unit is required. For example, if a plastic impeller fails, it is not advisable to purchase a completely new fan - it is enough to buy the impeller itself and replace the defective part.
However, situations often arise when there is simply nowhere to buy the necessary elements. In such cases, they try to restore the working capacity of the problematic part (at least for a while), but the search for a replacement does not stop. Stopping the gas boiler means the absence of heat and hot water, which is unacceptable in the Russian climate. Therefore, the solution of emerging problems should be immediate and as effective as possible.
Can you do the repair yourself?
Current regulations prohibit self-repair of gas equipment. This point must be taken into account when proceeding with restoration measures. However, there are a lot of ambiguities in this matter - there are other components in the design of the boiler that are not directly related to gas equipment.
If the secondary heat exchanger or the blower blower fails, the gas supply system will not be affected in any way. To solve such problems, it is necessary to call a technician from the service center. He has all the necessary permits and permits, gas inspectors will not have any questions.
It is necessary to take into account one more issue - the validity of the guarantee contract. The conditions are quite strict - installation and initial start-up must be carried out by the employees of the warranty workshop (service center), routine repairs or maintenance of the boiler are also carried out by specialists.
Independent intervention in the design of the boiler is regarded as termination of the warranty contract at the initiative of the user, and you will no longer have to count on free repairs. Even replacing the plug on the power cord can be considered such an intervention, therefore, it is recommended to immediately call a service technician in any situation.
With self-repair - the boiler will be removed from the guarantee
If there is no way to contact specialists, you have to act at your own peril and risk. When buying a boiler, you should immediately find out where the nearest service center is located and whether it is possible to quickly solve possible problems.
If the warranty workshop is located too far away and the master does not visit the house, it makes no sense to conclude a warranty contract.
Troubleshooting video tips for Vaillant boilers
