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Problem with Worcester boiler pump?

I have a Worcester 28CDI boiler and i recently replaced a faulty pump. However, the new pump seems to operate intermittently. When i turn the heating or the hot water on, the boiler goes through the sequence and i have tested 240V at the pump terminals but the pump does not always start turning. If i take the cap off the pump and turn it sharply with a screwdriver then it starts turning and runs fine. Any ideas??

Thanks in advance :)
Andrew, April 2010
Hi, this is Worcester, Bosch Group

Our technical team can help with enquiries, please call 0844 892 3366

We look forward to helping you

Worcester, Bosch Group, April 2010
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