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Hi I have a potterton suprima 30 boiler and a potterton EP2002 control unit. If the hot water and heating controls are at the "on" position so that they are running 24 hours a day then the hot water does not heat up once it has been used up. It appears that there is a fault where...

ivanov, Did you ever fix this problem? I have the same issue Danny

I thought i'd bring this topic back to life as I still have the banging noise when the motorised valve closes and am no closer to finding a solution. Any other ideas? Danny

Gasguru, All the pipework appears to be securely clipped. And yes there is a bypass valve, with a knob - I guess so you can adjust the rate of flow. Yesterday, I was able to recreate the problem using the cylinder thermostat - when I turn the temperature down, after the water has been...

I spoke to a plumber on the phone, who unfortunately due to personal reasons was unable to come and visit to perform a diagnosis. Based on my description of the problem and my hot water system he said it is most likely to be that the motor in the Honeywell Powerhead is starting to fail. How...

Just had another big bang. Checked the boiler - it is off. However the pump in the airing cupboard is running. Any ideas of the significance?

The temperature knob is already near to the lowest setting - I have turned it all the way down just to check. It is a single loud bang - pretty sure it's the pipes - it might be coming from the airing cupboard - where the hot water cylinder is (it's a Megaflo)

Thanks for your help so far. I believe both are OK. The tank in the loft has water in it and the pump appears to work when the boiler is on. There are no problems with the hot water itself - there is plenty of it. The only problem is the loud bang in the morning and evening!

It is a Potterton Suprima boiler. I believe the circuit is pumped.

Hi All I have been experiencing what I understand to be Water Hammer for many months now. The problem appears to be when the boiler starts-up first thing in the morning and in the evening - I get a loud bang from the pipes. It is definitely the hot water system as the central heating is off...