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Faulty boiler or faulty pump?

When I turn on the hot water or heating on, the boiler switches on but after couple of minutes or so the boiler starts to make loud banging noises and eventually shuts off. The pump keeps running even after hours the boiler was shut off and it looks that the pump has become slower even set at top speed. Someone please help me to diagnose what could be the problem.

Sam
October 2009
Heating, Home Heating SystemsFaulty Boiler Faulty Pump
sounds like the pump, it may be running but not quick enough to force the water around the heat exchanger & the water is kettling (boiling like in a kettle!) which is what the banging noises are

bamba
October 2009
sounds like a faulty pump or a heavily sludged up system.

Ian
October 2009

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Boiler Banging & Pump Issues - Help!