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Its nearly always the transformer a really really common fault on these

Thanks for the fast response Mostly F11

Hi Does anyone on here know what component actually fails on Glowworm CXI/HXI PCBS as I seem to come across a lot of them that are faulty and there must be some week components on these boards.

Hi All I am an apprentice gas engineer and was wondering if anyone can advise on what differential temperature i should have across combi plate heat exchangers. I am looking for a sort of generic answer if possible to check for blockages etc Many Thanks in advance