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how can i fix my combi 80?

combi 80 set pressure gauge to 1 bar start central heating system pressure gauge rises to 3 bars then i have to switch it off and gauge seems to return to 1 bar or lower when cold tap hot water is fine

paul
August 2010
Heating, Home Heating SystemsSet Central System
you need to have your expansion vessel re-pressurised.

Ian
August 2010

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Mend Home Heating Systems
Mend Heating, Home Heating Systems
Free repair help for home heating systems