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^ thanks - any pointers on how to bridge it out to test? Not familiar with that term/process. Cheers

It's Off-Flash-Flash rather than On-Flash-Flash - it could be that the red lockout light on the left is faulty and it is the Dry-Fire section of the fault list, I don't know how to check that possibility though.

Hi, new here, moved into a house last year and have been learning a bit about the central heating as it was a bit of a mess when we got here. Replaced the water pump, cleaned out the magnetic filter etc. Boiler was ok. The heating and hot water's not been on in months. Put heating on the other...