Hi, my Baxi 3solo pfl 30/80 started making a constant humming/buzzing sound when idle (like a noisy old fridge) from the PCD area. If I flicked the switch for heat or water the boiler fired and the noise stopped until put back to idle and it would start again. It is definitely in the PCD area as I removed the PCD housing unit and you can feel the sound resonating through my hand. My question is do I just need to change the whole PCD or is it a component on the PCD. Or does anyone know better.

Kristian, July 2014

Thanks Toptrish for confirming my thoughts. Replaced PCB and all sorted.

Kristian, July 2014

Sometimes transformers buzz when the windings come loose there is little you can do except replace the board, if its not too annoying leave it

toptrish, July 2014

Sorry mind elsewhere , obviously I meant PCB.

Kristian, July 2014