I have a potterton Suprima 80L boiler and noticed that the central heating is not working and the hot water is eratic. It keeps locking itself out and I have had to reset it a number of times. Sometimes it ignites and the hot water is okay but I have not been able to get the central heating to work. I was told that it may be to do with a blockage in my radiators. I've heard that there could be problems with the circuit boards as well. Can anyone advise. I am being quoted from £58-£78 for first hour for engineers to come out and Potterton is quoting £279 to sort out the complete problem.