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Grundfos Selectric 15-50 - noisy when on, intermittent banging?

For the last few weeks our pump has been getting noisy, now we get loud vibration/banging noises that are sometimes short like a car turning over, sometimes as long as a minute. The water is still heating up but takes a long time.
The pump gets too hot to touch after being on for around 20 minutes.
Any ideas?

Nicky, August 2010

home Fix label Heating label_important Home Heating Systems category Grundfosdone

try turning it down to number 2 or even number 1, purge(bleed) system with the power OFF to boiler

lee, September 2010

we replaced the pump.

It is purring now.

Thanks for your help.

Nicky, August 2010

Thanks Ian. I suppose I was also wondering if it's definitely the pump making the noises, would the valve make it do this if is was that that was faulty?

Nicky, August 2010

replace the pump

Ian, August 2010

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Grundfos Selectric 15-50 - noisy when on, intermittent banging?

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Grundfos Selectric 15-50 - noisy when on, intermittent banging?

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Grundfos Selectric 15-50 - noisy when on, intermittent banging?

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