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Update: Drained the tank of HW earlier today and put the boiler on HW only. To my surprise, the boiler stay on for a full 20 minutes but then cut off again. Checking the water, it was now lukewarm, so some heating of the water had definitely happened. I turned up the thermostat (from about...

With HW only selected, everything works as it should...for about 20 secs. I have noticed that the boiler has, on 2 occasions, stayed on for a couple of minutes - again, everything working as it should (including pump) but then switches off. Am I right - with my extremely limited...

Hi, first post. :) Have been searching and reading up for a while and need some advice with my problem before I go and spend lots of money on it! Any advice very much appreciated as boilers are definitely not my strong point. Situation is that we have a Glow Worm Compact 100 boiler...