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Thank you for your reply. When i got home i decided to have a look at the boiler before i called an engineer. It was still refusing to ignite, instead repeatedly going to the red light described above. I switched it all off and removed the main cover and then internal cover. When i tried the...

I have a ravenheat csi 85A condensing combi boiler. Recently the hot water started running hot for a few minutes then started running cold then hot then cold repeatedly in 10-30 second phases. There is less of a change in temperature if the central heating is on as i guess it is stealing heat...