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I'm glad the diagnosis appears to be correct, but I have already ordered 5111603. Luckily there isn't a huge difference in price between that and 5112178 (£10). Thanks for all your help. This site is a great resource of information.

I am rapidly coming to the conclusion that the boiler PCB is at fault, especially as I have managed to get the CH going this evening by switching off power to the boiler and switching it back on again a few times. Eventually boiler kicked in, green LED stayed on and my rads are warm. So need...

Oh, and the green flashing LED on the boiler means 'Boiler Temperature Control Satisfied' according to the manual.

Thanks for the replies, I really appreciate your time and collective expertise. This problem is certainly making me scratch my head. The hot water is not heated directly by the boiler. Mains water is passed through a plate heat exchanger in the Boilermate 2000 before being fed to the taps so...

I have a Potterton Suprima 30L with a Gledhill Boilermate 2000 thermal store. The system has been running beautifully for the past 2 1/2 years since the PCB on the Suprima was changed for the new version (5111603). However, in the past few days, the boiler has started becoming 'stuck' with...