how can i fix f 75 fault on vaillant ecotech boiler?
i have a f 75 fault. i have repressurized the system but it only reaches 0.8 bar. it just wont activate. no flame icon or gas flow icon? any suggestions?
i live in a large block of flats and i don't know anything about the buildings mains. i have had no problems before and this morning system just shut down. the pressure had dropped almost to nothing when i re-pressurized it went up but stopped at 0.8 bar.
Do you have a water pressure regulator inline from the mains?
Bob, March 2011
Mains water pressure into your house low.
Bob, March 2011
thank you bob. i have had the valve loop thing open to try to raise the pressure but it simply wont rise above 0.8. is there any suggestion as to why i might have this pressure issue?
pete m, March 2011
System water pressure must be 1.0 bar (cold) for the boiler to function.
