The main malfunctions and error codes of Wisman gas boilers and recommendations for their maintenance

Viesmann gas boilers are considered one of the most reliable. Their quality has been verified by many years of experience and various operating conditions. But, like any technique, even the most reliable gas boilers can give errors. In order to prevent serious damage, it is important to immediately decipher the problem code and solve it.

Basic errors and malfunctions

There are a fairly large number of errors that the Wiesmann boiler can produce in case of problems in operation.

Error code 06

Indicates that the system burner is blocked. The problem occurs due to insufficient pressure build-up in the water heat exchanger. To prevent such a code from appearing, the operating pressure in the membrane barrel should be maintained. At the inlet, it should not be lower than 0.8 bar. To eliminate the breakdown, it is enough to bleed excess air from the radiators and replenish the volume of coolant through the make-up valve.

The make-up valve for Viesmann gas boilers is located in the lower part of the body on the front side.

Error code 0A

If this fault occurs, the burner will also be blocked. The reason for the violation lies in the too low dynamic pressure of the incoming gas. Permissible rate of dynamic pressure for the smooth operation of the system is 8-25 mbar.

Wisman boiler error codes

To fix the problem, you will need to check the pressure in the system with a gas pressure gauge. If the gas is supplied with insufficient force, you must call the gas service company to increase the pressure. If the gas flows with normal force, the problem lies in the malfunction of the pressure control switch. Only a service center can help in this case.

Error code 0C

Also, the burner is immediately blocked. The reason lies in the low voltage of the network where the boiler is connected. This usually happens when several powerful devices are connected to the power grid at once. As soon as one of them is turned off, a sufficient voltage level will be restored. In order not to think about possible problems with the power supply of the boiler, it is enough to install a stabilizer.

CC error code

This violation signals the failure of the external expansion module. To correct the situation, it is necessary to restore the connection between the module and the boiler controller. Usually it is enough to check if the cable is connected to these two elements of the system, it sometimes falls out. If the wires are broken, a complete replacement of the cable will be required.

Error code F02

Error code F02

The violation is displayed when the burner fails. After the error code appears, you will need to check how full the system is with coolant.If necessary, excess air is bled, usually it stagnates in radiators or a circulation pump. If these manipulations did not help, you will need to check the operation of the temperature limiter.

To do this, you need to carry out the following manipulations:

If checking and changing the temperature limiter did not help, you need to check if the gas burner is blocked. When it fails, it is better to contact the service.

Sometimes this error code is displayed when the connecting cable is damaged. The problem will not be solved until the connection between the elements is fully restored.

Error code F03

With this problem, the signal to start the flame appears before the burner starts. Typically, such a code indicates the need to repair the ionized electrode. In rare cases, it will be enough to reset the system and restart it and check how all the contacts are connected to each other. But more often a more serious repair is required.

Error code F04

Error code F04

With such a violation, the system does not receive a signal to start the flame. Usually the problem is solved by restarting the entire system. If this does not help, you will need to check the ionized electrode and ignition electrodes for damage. If they are mechanically damaged, you will need to contact the service center.

Error code F05

Violation lies in the furnace apparatus.After starting the burner, the air supply relay cannot open. The solution to the problem must be sought in the Air and Combustion Products system.

1. If there is ice on it, it should be knocked down.
2. If the coaxial chimney is installed incorrectly, a correct installation is required.
3. Perhaps the fan is not working, then you just need to replace the cooler.
4. Sometimes you can see a melted venturi pipe, it should also be dismantled and installed on a new one.

These manipulations will help get rid of the problem.

Error code F08

Appears when the solenoid valve is blocked. With this error, the burner is also completely blocked. To remedy the situation, you will need to check whether the relay, valve are functioning and whether the connecting cables are interrupted.

Close attention must be paid to the solenoid valve:

In this case, you will need to inspect the cables or contact the service if the problem is with the relay.

Error code F51

The problem is related to the lack of water heating in the boiler. The violation appears after a short circuit of the sensor that measures the outlet water temperature. Before replacing the element, you will need to check its performance. To do this, you will need to disconnect the cables and check the resistance. If it deviates from normal, repair is required.

Error code F78

It is required to check the connection of the temperature sensor in the collector S1 with the external module. If the cable is disconnected, it needs to be pushed in tighter. If damaged, it is simply replaced. No other repairs are required.

Error code F80

The problem is also related to the external module. Appears only due to a short circuit of the temperature sensor in the collector S2. After checking the resistance level, it is required to replace the element with a new one.

Error code F88

Appears only if there is no electrical signal with the lower DHW cylinder sensor S2. It is directly connected to the external module. To fix the problem, it may be necessary to completely replace the sensor or the cable that is connected to the outdoor unit.

To verify that the sensor is malfunctioning, always pre-measure the pressure in it. If it is normal, the problem must be looked for elsewhere.

Operating recommendations

In order to avoid errors, it is important to follow the manufacturer's recommendations for servicing gas boilers:

1. Only fresh water can be poured into the system, if necessary, making it less hard. The maximum allowable water hardness is 4.5 mg / l of salts and other impurities.
2. Regardless of the quality of the water, it is still recommended to install additional filtering devices.They not only protect the system from hard water, but also screen out fine fractions that can shorten the life of the boiler.
3. Remove ice from the system in a timely manner so as not to leave the heat supply.
4. Do not leave the boiler unattended so as not to exceed the maximum allowable temperature inside the system. This leads to rapid burnout of the walls of the structure.
5. Be sure to maintain the pH of the water at 6.5-8.5 units. Other indicators will lead to the inability of the device to function.

Questions and answers

It is important to immediately pay attention to the appearance of error codes for Wiesmann gas boilers. Some of them are critical and during further operation of the boiler can lead to a complete breakdown of the entire system.

Video review of fixing error F04 at the Wisman boiler