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HI I am afraid it does not fire up for the hot water. The sound that came from the area of the boiler/flue was like a hammer!! .......and very loud.

We have an old Myson Apollo boiler which has given us no trouble. Suddenly we heard loud \\\"knocking noises\\\" that seemed to come from within the boiler itself. As a result, the pump works. The pilot is on. Thermostat is up but the heating does not work - ie does not \\\" fire up\\\" Can...