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It matters because the old style board used to switch the pump on and only turn the gas on and off when the boiler stat demanded it or until the there was no call for hot water or heating. i.e the pump ran constantly which when trying to sleep was ok as you got used to the drone. Now it...

I have just had my Potterton Suprima upgraded to the new PCB (Part number 5111603) and find that when the system is calling for heat (HW or CH) the pump switches on, then the boiler fires up. When the boiler get to temperature it switches of the gas, overuns with the pump and then switches the...