I'm just guessing, but many boilers power the pump via the circuit board in the boiler. This is so that the pump can typically run for a few minutes after heating/ hot water demand has ceased. Could be that your pump has wrecked this part of the circuit, so you need a replacement/ repaired circuit board, expensive. There are online suppliers e.g. cetltd, who'll supply a refurbished one.
Remember, I'm only guessing, thoguh trying to help!
Colin
January 2010
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