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Have been told by British Gas that the pressure is low - so 16 or so when running (Ideal combi boiler) but falls to 4 or so if you turn on hot water tap. They checked gas governor and it was fine - then they fitted new valve - lots of silt from the pipes in it. They say that we need a compressor...

Please help - we have a three year old Ideal Combi boiler. Last year a new control panel was fitted as LF (does this mean low flame?) kept showing then system would shut down - particularly when turning on hot water but sometimes when turning on central heating as well. There would be a banging...