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I have a glowworm boiler Fuelsaver MKII. I believe that I have a sealed system. There is a Flamco Expansion vessel attached. I recently removed a couple of radiators for redecorating. I have replaced one of them. the other is still off. The pressure guage is showing between 0 and a...

I took off two radiators for decorating purposes. Then the heating stopped working. I put one of them back and tried to bleed the valve. The boiler starts for about 10 seconds and then stops. It makes lots of spluttering noises and I cannot get any hot water. The boiler is a glowworm...