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Apparently yes the gas valve settings were checked. The annoying thing is it ignites but within 5 minutes goes out!

Thanks for all posts of help! Basically the boiler lights then dims which its supposed to do but instead of dimming it goes out. Then the boiler shows a red light against flame failure. We've had a corgi registered engineer looking at it and he's stumped!

Thanks but we've changed the PCB already and wasnt that either!

Please can anyone help?? I've been without hot water for the past 4 weeks and no heating for 4 weeks also. :( Basically the boiler ignites then dims but goes straight out indicating flame failure on the boiler. We've replaced the air pressure switch, checked the flume and the circuit...