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I'll change the fuse as you suggest when I get a chance to get some 1A fuses, the boiler already has a 2A fast blow fuse fitted and the manual says the power consumption should be 190W so its worth a go. The part number for the new board is 5112380, although the original old board (the one...

Thanks for that namsag, I forgot to mention that this is the second board I've tried. I took the first one back because I thought it might be faulty and they gave me another one. Both boards doing exactly the same thing. Frank

Thanks for the response Tony, I think you're probably spot on with the gas measurements. After spending a few hours on the web trying to find an answer the general consensus seems to be something to do with the low pressure setting on the gas valve. So I guess I'll have to get the CORGI man to...

On Saturday night my boiler suddenly stopped working, a quick investigation showed that one of the copper tracks on the pcb had burnt out. No problem I thought get a new pcb and job done. Replaced with new board (part no. 5112380) with the result that the DHW works fine but the CH goes through...