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how can I mend my Kingfisher Potterton boiler?

The boiler starts and heats up normally but when the water correct temperature has been reached the boiler shuts down only to refire and light again causing the water to overheat and be released through the relief valve. Help please asap
Mark, September 2006
Thanks Paul - the boiler is only three years old. I have already tried changing the stat and power flushing the system.

Mark, September 2006
it sounds like boiler stat as gone is this a very old boiler. poss stat not turning off

paul, September 2006
link Click here to see other fixes for Potterton.