Vaillant boiler f20 fault
The F20 error indicates an emergency shutdown due to tripped safety temperature limiter STB. It …
Vaillant boiler fault code f25
Flow temperature rising dramatically fast (5 degrees per second or so) Why it happens The …
Vaillant boiler fault f24
The F24 error signals an emergency shutdown due to a sudden dramatic increase in temperature. …
Vaillant boiler fault code f23
F23 appears when there is not enough water in the system or there is a …
Vaillant boiler f29 fault
The F29 fault code will appear on a Vaillant boiler’s display in the following cases: …
Vaillant boiler error code f28
The F28 error code means the pressure in the system is close to zero. It …
Vaillant boiler error code e82
How do I fix the E82 error? Press and hold the room stat jogger for …
Vaillant boiler error code f22
This error code appears in Vaillant boilers when the pressure sensor detects a pressure …
Vaillant boiler error code f75
This error code denotes poor pressure change detection at the launch stage. This is …
Vaillant boiler troubleshooting
The Vaillant company is one of the leaders in production of boilers. The multilevel quality …