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Mira 723 is making thudding noise when move temperature control?

Mira 723 is making thudding noise when move temperature control. Lessens when full flow on or when I move the thermostat to very hot or very cold. Stripped it out and can't see anything wrong - not many parts to go wrong.
Jim, Glasgow, September 2011
link Click here to see other fixes for Mira 723.