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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
VaillantHeating, Home Heating SystemsF 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

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