C/H Boiler - The solution??

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writes> >Perhaps you could change the pump (which is not a huge expense) and see if

Pump IIRC about 30 from wickes.
Regards, NT
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You have ascertained that the burner fires and the pump does not run at times causing the overheat problem. You could have a multi-meter, mains tester screwdriver or a temporary light attached to the wires of the pump. If the pump does not run and say the bulb lights up, then it is most probably the pump. If no signal to run the pump, then something deeper and the pump is fine. The burner should never fire without the pump running.
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