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I have a Halstead Eden CBX combi boiler - just over 2 years old. I sometimes notice two upstairs radiators clicking as they heat up even thought central heating is not selected. My Gas Safe plumber checked the diverter and motor and all the thermostats and all seemed fine. It seems to happen...

Thanks Dave - I forgot to mention the no 2 led warning light is coming on too - which the manual says is because the flue gas is too hot. Could it be something as simple as the rads need bleeding and a serious air lock is causing the problems?

Halstead CBX32 boiler fitted Jan 2007 - serviced every year. Have moved out of house since, couldn't sell so rent it and tenant says radiators come on even though he's turned the central heating off (hot water is on.) I'm about to drive over and look at this - only thing I can think of is that...