Oil-fired, 2-zone (upstairs/downstairs) CH. Conventional (not combi) boiler. Drayton wireless programmer and wall stats.
The downstairs CH only comes-on intermittently... if I hit the boost button on the programmer, the red light comes on, but (intermittently) the rads stay cold. Usual workaround is to keep switching it on and off until, eventually, the CH comes on. The upstairs zone is fine.
I'm assuming this sounds like a sticking motorised valve?
The downstairs CH only comes-on intermittently... if I hit the boost button on the programmer, the red light comes on, but (intermittently) the rads stay cold. Usual workaround is to keep switching it on and off until, eventually, the CH comes on. The upstairs zone is fine.
I'm assuming this sounds like a sticking motorised valve?