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I think half a turn hardly constitutes overriding a safety device. the interlock circuit is designed so that the pressure switch has to switch from "off" to "on" when the combustion fan starts. And yes i have had a qualified person who checked the differential pressure to the switch with a...

Just an update for anybody who may have this problem in the future. I ended up replacing the board with a brand new one and it DID NOT cure the fault. The fault turned out to be the combustion fan pressure switch which was intermittently not switching over when the combustion fan was starting...

Andy thanks for the info, this is exactly the info I was looking for. I understand what you mean about concentrating on the hot water and ignoring the central heating. I will follow up on your info and wait for the fault to happen again. Thanks a million and i'll keep you posted.

Tony thanks for your reply, I take your point about it not being a diy job. I should mention that i am an electrical/instrument tech for kelloggs so i do work on industrial gas burners for ovens, but of course i am not qualified to work on domestic gas boilers, but if it is an electrical...

Hi all, Hope somebody out there can help me with an intermittent fault with my Powermax 185. Note that the boiler is set to 24 hour mode for both heating and hot water. Roughly once per day the boiler will not react to the central heating or hot water falling below temperature. The...