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I have a new Potterton gas boiler - installed only 6 months ago. It has started making a very loud noise when it turns itself on (its programmed to come on automatically with the timer), but makes no noise when it turns itself off. The noise also starts when the hot tap in the kitchen is...

I have a Valliant boiler. Whilst the Central Heating was on it was working at 3bar. It was like this for a few weeks. Now the pressure has completely disappeared (i.e below zero), whole boiler has now shut down (no hot water or heating), and doesn't refire I have called out an engineer...