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- 13 Dec 2007
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It is a fair chance of it being the PCB.. Clearly the PCB is firing the boiler so it knows that the sensors are calling for heat.. Generally if there is 240v at the pump then it is the pump, if not then it is something further along the line... You can tell what the boiler is trying to do from the display but if the store is trying to heat and there isn't 240v at the pump, then my money is on the PCB