Hi,
I will email the heating engineer in the morning, but if anyone knows a simple fix I can try it today.
We have 4 UFH manifolds, all has been fine until Friday.
The kitchen seemed cold. I thought the thermostat maybe wasn't calling for heat correctly and checked that out.
It still seemed to be slow warming up, so I went to the manifold and turned the flow up slightly.
What seems to be happening is that if you turn the flow up past a certain point the water stops flowing.
Basically any higher than 2 on the mixer which is 22-23C and the flow stops. Even then I had to jack the pump up to maximum to get much flow.
The other manifolds are set between 36 and 42 and running as expected.
Probably wasn't an issue until the temperature dropped below zero.
Any thought?