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Guys... thank you both for your replies. One further observation.... when I turn the Boiler stat up and it cuts off... the pump stops too. With the stat lower the boiler only cuts in and out the pump keeps running. Think my plan is going to be this. If turning the pump up keeps the house...

Thank you for your reply, Yeah sorry... it's an Ultmiate 50 ff. I guess that's important. Yeah, pump is running freely. Don't think I've got an air lock as all radiators are hot. How can I be certain? I've just switched the pump to speed 2 and the radiators feel noticably warmer...

Last winter I had a lock shield valve start to leak on me so I drained the system to change it. I figured if one was on the way out the rest wouldn't be far away... so I changed the rest of them while the system was already empty. However as I was desperately trying to switch the water off I...

Yeah... boiler always starts up from cold. It just seems so cut out too early when it's heated.

On other observation.... If I turn the boiler thermostat right down to zero, this seems to set the pump running without firing the boiler. If I do this for a minute then turn the thermostat back up the boiler fires up again. This supports my idea that the boiler's overheating, what would...

HI there, I have a problem with a Gloworm 50ff that perhaps someone can help me with. My boiler will fire up and run for around 10-15 mins all my radiaters get hot, then even though the room thermostat and the thermostat on the boiler is calling for heat the boiler cuts out. After 5-10...