VIESSMANN Gas Boiler Error Codes

Error F2

Defective construction unit - burner. The temperature limiter controls this parameter. Remedies: The filling level of the unit (pressure) must be checked. To do this, check the pump and, if necessary, vent the system. Also check the cables and temperature limiter.

Error F3

Malfunction of the burner. It is required to check the efficiency of the ionization electrode and the connecting cables.

Error F4

Malfunction of the burner. There is no flame signal. The ignition electrodes and connecting cables are checked. Also, there may be a problem in the gas pressure or the gas distribution valve. Still need to check the ignition and ignition module.

Error F5

Faulty gas burner. Problem in the air pressure switch when starting the burner: not open or close when the speed is reached during the load during the ignition. The system "Air-combustion products" LAS, as well as a hose and air pressure switch with connecting cables are required to be checked.

Error F6

The burner is defective. The device of overturning of draft has worked more than 10 times for a day. A verification of the flue gas removal system is required.

Error F8

Burner failure. The gas regulating valve closes with a delay. It is required to check it, as well as two connecting cables.

Error F9

Damage to the gas-automatic machine. Malfunction of modulating valve control. It is necessary to check the flame control device.

There's the Viessmann Gas Boiler Error Codes List