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I have one of the above central heating boilers. It has the problem that whenever you run the hot water, then turn the tap off, the pump stays on and after a few minutes the system makes an audible bang and gurgle and the 'Lockout' light switches on and it is necessary to press the reset button...

The system usually makes a load gurgle then the 'Lock out' light, lights up whereby there is no hot water or heating. Once the 'reset' button is pressed, it starts working again and we get between an hour and 2 weeks use of the boiler before it happens again. It is very annoying. Does...