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how can i stop my ferroli optimax he 31e from losing pressure?

pressure drops by half a bar every day , resulting in topping up every other day. any suggestions on how to stop it dropping pressure please.

caren
January 2010
FerroliHeating, Home Heating SystemsStop Ferroli Optimax
two possibilities, you either have a water leak , or your expansion vessel needs recharging.

Henry
January 2010

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