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CH Pump making an irregular squeaky noise

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R

radiojon73@yaho

Dec 6, 2016
6
1
3
I had a new Vailant boiler installed 2 years ago, and the system has needed a motorised valve replaced twice and now the Onyx pump has started making an irritating and irregular high pitched squeaking noise.
Can anyone advice me what the fault could be ?

Many thanks
Jon
 

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