This one is driving me mad. I’ve had 4 different plumbers out and none of them have resolved the issue.
issue:
underfloor heating has stopped working downstairs. The pipes into manifolds (top row) are hot. The ones on the second row are cold. Last year I was able to control the pressure on each individual manifold by turning them but this year the red gauge doesn’t move
system:
- thermostats via hive. Always has been and worked last year so nothing to suggest it’s this.
- the pump is grundfos upm3 auto. 25-70 130 zzz
- manifolds are snug
- boiler is ideal logic max heat h30
- a 250L prostel unvented hot water tank is connected to the system.
- I’m attaching photos of the system too.
To note:
- this system worked perfectly fine last year (it was installed over the summer of 2022. Worked last winter but not working this year.
- it’s fed by a boiler. The boiler isn’t showing any faults.
- the boiler also feeds the upstairs UFH and this is working fine.
- downstairs isn’t working.
- there are several circuits for downstairs and none of them are working. So it suggests that the problem isn’t in one individual pipe.
- One plumber has changed the pump as he thought it was this. No luck.
- one plumber has used a hosepipe and changed all the water inside (I guess that’s checking / removing any potential airlocks or blockages). Still didn’t work.
- todays plumber was convinced that it was the heat control to the left hand side of the manifolds as once turned down the pressure in the manifolds did move. But after several hours it’s still cold and the return pipes are cold.
please help me get downstairs warm for Christmas! Thank you
