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pressure dropping on domina 80e?

Pressure keeps dropping to 0. I had a similar prob with my Worc Bosch and it was the valve not shutting off to the overflow. I can't find the overflow on the domina to check this out - instruction booklet doesnt show where it is, is it internal....

Denise
December 2011
BoschHeating, Home Heating SystemsPressure Prob Valve
Overflow pipe out side wall drain connected just follow that pipe which connected to pressure relief valve,change it

ltd
December 2011

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