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I was hoping someone can help me? I have an oil fired boiler which seems to work fine but the last few days my rads have not been coming on when timer is set. If i switch off the hot water then then the heating i can hear the diverter switch change and when switched back on the heating comes on...

I have a Potterton Promax combi HE Plus, which is about Three years old. The central heating appears to be fine, however when I run the hot water I get a a horrible knocking/banging sound from inside the boiler and the pressure fluctuates between 1 and 1.5 bar, the noise stops as soon as the...