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Thanks for the suggestions gents. I finally narrowed it down to:- yes the boiler does work perfectly on HW & CH. The problem I thought was the thermostat? So, I did an ohms test on the wire between the thermo & terminal connection(thermo) on the boiler. My readings were ambiguous. So I...

Hello everyone, I'm new to this forum. :D Can anyone solve this problem or put forward any similiar experiences. My boiler works fine when distributing hot water,but as soon as I demand the central heating to work-it causes my house fusebox(rcb) to trip??? Any ideas? This only started last...