glow worm 30 cxi combi

12 Nov 2009
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United Kingdom
hi all I have had a glow worm 30 cxi combi boiler installed, maintained, and trouble free for 7 years, recently we had a power cut and when the power came on again the boiler was showwing a F12 fault ,telling me to check the wiring, before I had chance to do anything we had another power cut, then when the power came on again the display window/screen was blank, nothing showing at all, I am not a boiler engineer, is there anything I can practialy do to find the fault before paying an engineer, my next door neighbour is an electrician although not a domestic boiler engineer, he has checked the wiring with a meter for current up to the circuit boards and display board and there is current to both any suggerstions please,cheers jd.
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thanks for that is there anyway of testing the PCB or is it a replacment job, I did check the fuse and it looked to be in good order, if its a new PCB have you any idea how much a replacement one would cost,cheers jd.
Isn't the front cover on these also the combustion chamber cover as well?

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Any low voltage component could cause this issue so its not as simple as changing the board. it COULD be the board but it could also be a list of other things.

I would suggest getting in an engineer to carry out some tests.

Glow Worm offer call outs that may be worth looking at which cover parts etc.
Is there a reset button on the front panel? A pen or pencil in the hole to press the button.
If it just happened after a power cut i would assume the pcb but you would still have to check the low voltage circuit because it could just be a coincidence that this has happened and the pcb for these aren't cheap.

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