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Before posting on this forum, I contacted Ideal technical help desk (basic support) & after explaining the symptoms they were quick to diagnose a fault external to the boiler. They said the voltage input was incorrect?? And advised me to get an electrician (though they didn't fill me with...

Chris - not sure what a Frost Stat is? I don't think I have one.

Thanks for all comments. Your right, the "C" doesn't flash & it is the LED next to it flashing. How do I locate the 3 port valve head or micro switch broken? Is the timer fitted to the wall?

I have the following irritating issue with my boiler: Even with the thermostat set to minium (zero) and the timer off, the boiler springs to life, every 10 minutes or so!! And all through the night. The boiler heats the radiators & hot water ok but it seems to have a mind of its own...