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Mend Ravenheat LST80 Combi Boiler Central Heating Repair

how can I fix my ravenheat combi white star LST80?

when I switch the central heating on it does work but the pressure guage goes up and when it stops the pressure goes to zero then there is no hot water or central heating have changed the auto air vent and bleed all system this has only happens when central heating is on.

al may
October 2007
RavenheatRavenheat LST80Heating, Home Heating SystemsCombi Boiler Central Heating Boiler Repair
call a corgi engineer

jules
August 2008
expansion vessel lost air pressure, 14psi so boiler blowing off through safety valve. dpmartin17@aol.com

paul martin
October 2007

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Ravenheat LST80 Combi Boiler: Pressure Issues