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Sorry to be ignorant, but what is TRV? Past few days when the heating has turned itself on it has been ok, there has been a fairly quiet "wailing/kettle boiling" noise, but bareable, then after roughly an hour it gets louder and I have to turn the heating off. It seems that having a tap...

It does it when heating and hot water are both on. It is fine with just hot water, no problems. But as soon as the heating is on and a tap is turned on, off it goes. But if it is going and the kitchen tap is turned on, it goes until the tap is turned off again.

Ever since I started having my heating on my combi boiler has been making strange squealing type noises. The noises only occur when the heating is on. Usually it is quiet at first, but as soon as a tap is switched on it starts squealing. A plumber has been round, first time couldn't find...