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ferroli 1001 gaining pressure?

Hi all
How would our combi be gaining pressure over a month when checked cold.
ie,start of month 1.2 bar cold
end of month 1.8 bar cold.
filler loop not in?
very strange
cheers
bob
west mids
uk

bob
March 2007
FerroliHeating, Home Heating SystemsPressure Cold 12
poss dhw heat exchanger leaking across to heating circuit.

hi-spec plumbing
March 2007

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