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Thanks Felix It was the stat. All fixed now

I beleive it may be the cylinder thermostat.....when the boiler is running turning it right up or down makes no difference to the operation of the boiler

I have central heating but no hot water! The boiler is a Glow Worm Micron and is only a few years old. I have taken the central screw out of the pump and it seems the pump is turning fine (its not loud and doesn't vibrate much but I think it is running ok) It certainly turned when I turned the...