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Loud noices pressure flys up then down?

My Potterton HE is making loud banking noices, it happens a couple of minutes after I switch it on. At the same time as the noise, which sound like explosions, the pressure flyes up then down. It can't be a leak as all my pipes are at floor level. any ideas :)

zack, September 2009

home Fix label Heating label_important Home Heating Systems category Pottertondone

faulty pump or blockage in system.

Ian, September 2009

OK, the system seems to be air locked, so turn the pump on to its highest speed - if its adjustable - and keep bleeding the air out from every possible bleed valve. However, if this continues its a sure sign that your system needs flushing out.

John, September 2009

it stays on. if I go to the valve and release air it runs ok for a couple of hours but then starts making noises again

zack, September 2009

I think the water pump on your boiler has packed in, and when the boiler ignites the water momentarily boils, causing the noises. The boiler should shut itself down immediately - I hope!

John, September 2009

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