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Kevplumb :lol: thanks for the fast reply If the pump is switching off at the same time as the boiler flames off - does this mean the stat is faulty? Should the pump continue running for a while :?:

Please help .... My Apollo Boiler & pipework is making banging noises when the heating thermostat switches off. The pump stops and the boiler flame goes out when the stat switches. I have already changed the High/Low stat but the problem persists. I have chemically cleaned and dosed the...