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Should read... In case changing the stat doesn't work, what do you mean by reseting it? Cheers Mike

Cheers Chris for your prompt reply. The wter pressure is ok. I think I have found a spare stat from an old boiler that my dad keeps as a donour. Will try that when I get home to see if it is compatible. In case changing it, what do you mean by replacing it? Cheers Mike

Problem started last night. No heating or hot water. I have shut the system down and re-started it. I can hear the fan start and the pump start and I hear it click on then off after a second or two. After about ten secs, the over temp light comes on. I have checked and greased the...