I have a Potterton Flamingo 40 boiler for the radiators only. This morning a banging noise was coming from one radiator which is located in the same room as the boiler. Possibly straight afterwards the boiler cut out ie stopped heating rads. The pilot light remains on. I have played with it and found that if left for 10 mins if fires up again but then after a few minutes cuts out. I also noticed that when I rotate the control ( I think it might be the thermostat ??? It goes from 0 to max ) the boiler starts to work for a few minutes then it stops. I have arranged for a plumber to come tomorrow and he reckons its the pump which will cost £150.00 all in. Any thoughts.