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Mend Boiler Pressure Fault

code 04 fault . loss of pressure?

the system losses pressure when not in use overnight . i added water through filling loop , boiler then starts up but the pressure then goes up to 3-4 bar and comes out of the over flow this happens every 2 days

andy
January 2009
Heating, Home Heating SystemsBoiler Pressure Fault
could be the expansion vessel

b
January 2009

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Boiler Losing Pressure - Code 04 Fault