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PRESSURE DROP: Not part of the sales advertising campaign where combi boliers are concerned. Does anyone own a combination boiler that does not drop pressure. Hands up all those owners of a combi boiler who know how to repressurize it. Hands up all of the combi owners who even knew that you...

There is a screeching noise coming from the boiler when the hot taps or central heating is turned on. It used to be for one second and after you turned the tap/thermostat off and then back on again all was OK. The system has been drained twice and all radiators bled (by qualified engineer). The...