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No worries,i was like that when i got given that advice. I had just fitted a new boiler around 7 years ago and i had another 24i in the van so i sswapped them and found the same proplem,i rang the supplier and he asked a fitter who was in there and he told me to check the supply from the switch...

See if the live and neutral arent crossed,make sure it is live at pcb and the neutral isnt live,if they are just cross over and see if it works