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Hi Chris The boiler did nothing, I checked externals and found a faulty room stat, I relaced this with a shorting link and the boiler now does it's start up checks but still no CH. Halstead suggested I turn the control to the spanner setting, this should fire the boiler up in low heat/service...

My boiler is 1 year old and tripped out with excessive heat as the fault cold. I ran it in DHW mode for12 hours with no problems. I am now trying to get the CH working and now it doesn't trip but does not respond to CH demand. Room stat is max and timer is on.