Combi Pump continues to run after burner has stopped

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Newboy1996

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7 Jun 2008
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When the burner shuts down the circulator pump on combi keeps running endlessly? The diverter valve is noisy, as it seems to give a "clunk" during program changes.
I know there is pump over-run on some pumps, but this never stops?
Its on a Worchester oil boiler, but I would think it would be wired like a gas combi as well?
Thanks for any help
 
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