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I think that as the system has worked fine since I speeded up the pump that this is the case and would also be the reason why the problem only starts after the system has been on for some hours,I just wonder why it hasnt done this before as it has run on speed 1 for a good few years. Thanks for...

Thanks Sidewinder,no its not a combi is a good old fashioned thing with a pilot light

I have a Glow Worm Ultimate 50BF Boiler, its about 15 years old but normaly works fine.Recently after being on for a few hours it shuts off & eventhough the room stat & boiler stat are calling for heat it wont fire up.The motorised valves are working ok when I alter the thermostats.The...