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My worcester bosch greenstar ri boiler seems to override it's control?

My Worcester bosch Greenstar ri boiler was installed 3 yrs ago. No problems.
Suddenly this morning, I've discovered the radiators were still hot even when the auto control programme has switched off. Any ideas as to why?
estate247, September 2010
Probably not a boiler problem, more likely a programmer issue, or diverter valve passing.

Carefree, September 2010
link Click here to see other fixes for Worcester Greenstar.