One zone will not heat up.

[John Armstrong]

Afternoon Fellas

If anyone has time to help with this snag it'd be much appreciated.

We have a wet-floor system controlled by John Guest UH3 and rather dated Heatmiser DT thermostats.

One of the upstairs zones is combined for the bedroom/dressing room. So that's 2 rooms, 2 manifolds, but one thermostat (in bedroom).

Just recently the temperatures (set at 17 degrees) have been behaving oddly. The bedroom will not heat up at all and shows 15 degrees in the morning. The dressing room meanwhile seems to overheat, I would guess 22/23 degrees and the carpet is warm to the touch. The controller correctly shows Power, Boiler, Valve and Zone light and both zone manifolds open.
All other zones work as advertised.

Any ideas out there please?

Cheers,








Anything I can try or check at this stage please?

 

[Sparkgap]

So, it's separate manifolds for the bedroom and dressing room. Have you checked the flow/return temps to the manifolds? Assuming each manifold has a pump could be the pump on it has jammed or failed.

 

[John Armstrong]

There are 7 manifolds total. I”m no expert but, I think the chances of each having its own pump is zero. Happy to be corrected.