The pump is called Myson compact. There's a small nut on it which can be pulled out a bit and is presumably linked with the pump valves. It says on the pump not to switch on the pump till its pushed back in. How can I confirm if its working or not?
Today afternoon I heard some loud banging noises from the pipes/boiler. Ever since I have no central heating. I have a 8 yr old Potterton Suprima 50 boiler which now has its green light flashing. I turned off the boiler and switched it on after about an hour. Again I heard these loud bangs. I...