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Thank you all for your advice. I stripped the pump and found to be sticking, tried to clean out but only lasted a day. So had to buy complete new pump as Worceser-Bosch wants more profits and will not supply only the head! Tried a Ideal head first but physically too large (could not put the case...

Thank you both for your replies and help. As the pump is in the 'startup' sequence I cannot hear it turning or is it especially quiet? I have checked that the mains power goes to it (on the pump connectors) when switching on the HW or CH which it does. I am going to buy a new pump as it's fairly...

Our Combi boiler is around three years old and now gives no DHW or CH. When switching on either the CH or DHW, the boiler starts fine - ignites and less than one minute starts to bang, the pressure gauge goes up and down and steam is emitted from the automatic air vent. The system shuts down but...