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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?

pete m
March 2011

Vaillant Heating, Home Heating Systems F Fault Ecotech Boiler

reprime your expansion vessel! clean out water pressure switch

platinum gas
December 2011

Fault code "F54" could be the water pressure sensor.

http://www.fixed4free.com/answers.php?id=299246

http://www.digitalspy.co.uk/forums/showthread.php?p=38604271

Bob
March 2011

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.

pete m
March 2011

http://www.plumbingpages.com/featurepages/HWPRV.cfm

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.

Bob
March 2011