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Many thanks again for your help - it's much appreciated. I've now adjusted the pressure and the gauge is now sitting nicely in the green at about 2, however the same problem remains. Boiler fires up when I turn a hot water tap on but the CH is not working. As soon as you turn the hot tap off...

Many thanks for the reply. Any idea how I top the pressure up - is there a valve I need to turn inside the boiler?

Hope someone can help. I've had my current boiler for three years - no problems with it at all, until yesterday when it didn't fire up in the morning. I flicked the reset switch a few times but nothing, so I left it planning on calling an engineer later on. But five minutes later it came on...