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overheat stat keeps tripping out?

i have a worcester 350 about 12 years old the overheat stat keeps tripping out the overheat stat is on the top of the boiler on the outside any ideas why this keeps happening
paul, February 2010
You will probably find the boiler is so scaled up inside its not circulating properly causing it to overheat.

boiler bill, February 2010
link Click here to see other fixes for Worcester.