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Thanks, I have but it hasn't helped. The fault finding is quite limited. Appreciate it was a long shot posting but worth a try

I'm planning to get an engineer in to check the boiler and service it in any case but would like to find the fault first if possible

Yeah, I thought that but photographed the old board and was super careful when refitting.... hmm

It's been good for a long time and I plan to call an engineer if I can't fix it, just hoping for some pointers - thanks

Replaced the pcb in my 901due to chattering relays but when I installed the replacement the pump and fan ran for about 20 seconds before the fuse blew. I replaced the fuse now the leds light (but are dim), the pump and fan run but the red led comes on after about a minute and everything goes...