That's the bizarre thing. Nothing has been touched since system was installed. The combiboiler is used daily. A few weeks ago it did lose pressure.. Maybe a sign for something?
I've a combi heating system only 4yrs old. all radiators have been working fine until now.
One radiator in the bedroom has ceased to get warm. The trv entrance copper pipe is getting warm and is slowly warming top corner of the radiator.
The exit valve copper pipe remains cold.
I have...
I presumed the cold came from outside straight into house.
The loft has a biggish black tank and a smaller one next to it.
The bath taps are just normal with the shower feed coming off that