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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
PottertonPotterton HEHeating, Home Heating SystemsPressure Potterton Switch
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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