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Thanks to all for your help with this, engineer is coming this week so I shall show him your replys and hope he doesnt think I doubt his expertise although when he said 'well I havent a clue now......' i was a bit worried. My apologies to scatmanjohn - this is my first time using DIYnot.com and...

HELP! This happened about 8 wks ago - switched heating on and sudden loud crashing and banging noises throughout house with shunting of pipes - boiler experts suggested 'kettling' due to new pump needed. When they came pump worked fine so suggested flushing out system at a cost of £500!!! I...

I have exact same problem with potterton boiler. Pump was replaced but 7 days later same thing happened pump not working and awful banging through pipes throughout house. Was suggested this was a 'kettling' effect due to pump not working but after new pump fitted and still a problem plumber...