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Protherm Combi Boiler?

Our Protherm Combi is losing water from the Over Flow Pipe and we have to keep filling the Boiler every 6 hours with water becuse its losing Bar Pressure....anyone help,Much appreciated,Thankyou.
AMANDA SHAW, March 2007
could be pressure release valve is faulty or if pressure rise when heating is on possibly problem with the expansion vessel

Bricks, March 2007
prv faulty (pressure releif valve)

hi-spec plumbing, March 2007