Thank you for the reply and help but you will have to forgive my ignorance. Do you mean the pump inside the boiler unit? If so then I don't hear any sound
My boiler has begun to make banging noises before tripping out. It has only just started (last few days) and has given me little problems to this point.
History:
HW tank replaced a few months ago by qualified fitter. All rads worked fine. CH thermostat system not always worked properly -...