Valliant F22 fault error code what does it mean

Loss of pressure in your system. The system’s pressure is determined by the amount of water it contains

In most cases, the leak will be coming from one of the below the Valliant eco tec does have a tendency to leak from a few places , Most common is the 3 way diverter valve, which will need replacing. It needs to be fixed if increasing your boiler’s pressure and it continues to drop. Call us on 07855382189