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Over the past year my boiler makes an intermmittent loud switching noise,this comes from the gas valve, but only seems to happen on the C/H cycle,I have also noticed that the boiler case gets very hot,infact to hot to put your hand on. I have lowered the boiler stat setting to 3 and the problem...

Problem solved.I used Radex non acidic descaler leftin for 4 weeks

My boiler bangs and pops both on heating and hot water cycles.I have used a FERNOX product which is injected directly into a radiator to stop boiler noises, but this did not work. My system is 25 years old my boiler a Potterton prima is about 8 years old, it is a normal domestic house c/h sytem...