Wet ufh. Not all rooms warming.

[JDAB]

Hi, hoping for a little advice.

 

After switching on my ufh I’ve discovered that two rooms in our bungalow aren’t warming. The system was installed before we moved here (just over 10 years ago) but we haven't altered anything in that time.

 

Upon closer inspection I found that the two actuators, linked to the thermostats in those rooms had stayed closed. I removed them, tested the pins (which all tested similarly to the others, firm but they do move) and re-attached. Voila! (I thought) as they slowly rose up. However, after several hours, no heat came to the rooms…

 

I’ve tried testing each non-working thermostat in isolation by turning them to max but no joy. I can’t feel heat coming from the supply pipes leading to those rooms either but the actuator tops do get warm. I’m wondering, is if this all sounds familiar to anyone? And is it something can resolve myself? Or am I in, call out a professional territory?

 

We did have a new boiler fitted around March this year. Though we haven’t had any problems with it.

 

We also had a small leak coming from the return area of the manifold. This was repaired shortly after boiler was fitted by the same person. I have no idea how long we had the leak but when I did find it, it was a single drip every 30 seconds or so.

 

Attached photos of the set up. And one (where i'm pointing) from when I noticed the leak.

 

From left to right on the manifold, the seven connected rooms are performing as follows:

 

O - NW - W - W - NW  - NW - W

 

(O = Off, W = Working, NW = Not working)

 

I do have Bosch AdvancedTemp Infrared Thermometer. Incase it help with fault finding.

Thank you for any help in advance.

[JohnMo]

Take the actuators off on the not working loops, does the flow meter move down (the red lines). Removing actuator opens loop, regardless of call for heat.  If this resolves issue you have an issue with electrics.  If nothing changes you have an issue with air in the system, get the plumber back to bleed the loops.

 

Takes all the junk off the UFH loop pipes. Look to box in, so they don't get damaged.

[Gus Potter]

32 minutes ago, JohnMo said:

If nothing changes you have an issue with air in the system,

Agree a bit of air can cause havoc. 

 

One way to purge this is to shut off the other loops and open the air vent. You'll need a bucket and a few towels to catch the water. 

 

Give it a good go and don't forget to top up the inhibitor once you have finished.