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I'm no plumbing expert, but that sounds pretty much the same problem I had a couple of years ago with my old heating system. My problem was a duff circulation pump... so get that new pump fitted sharpish, it's probably that.

Right, just got my mrs to do a test whilst I was on the phone to her. Turn on hot tap, boiler fires up and hot water comes through as it should. Turn off hot tap, fan/pump/burner light stay on for about 5 secs, burner light goes out, fan/pump continue to run for another 5 secs, then the noise...

I'm pretty sure the fan/pump/burner all stay running for 10 secs or so after a hot tap is turned off (I'll double check later). When the fan/pump/burner switch off it's at this exact same time the clunk/knock sound happens. It doesn't happen as soon as the tap is turned off. It sounds to...

Under a week. Plumber is coming back to look into it, but I like to be prepared just incase I get fobbed-off. :)

Was wondering if anyone is familiar with this boiler and it's running operation? When I run the hot water (from any tap), the boiler fires up fine and I get hot water as I should, when the tap is turned off the boiler continues to run for approx. 10 secs or so, then when the boiler does shut...