ᐅ 3 underfloor heating circuits in the bathroom, 1 not working, what should I do?

Created on: 6 Dec 2018 07:30
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KingSong
Hello everyone,

We have now been living in our new house for a week. Our main bathroom is equipped with underfloor heating consisting of 3 heating loops. The spacing of the heating pipes is 5cm (2 inches). Unfortunately, I noticed that one of the heating loops is not warming up, and it happens to be the one under the toilet :-(

What I have tried so far is setting all 3 loops on the manifold to the maximum flow rate, currently at 4 liters per minute (1 gallon per minute). The ERR function is deactivated. The room temperature setting on the heating system itself (heat pump) is set to 22°C (72°F).

What can be observed is that the floor areas with the other 2 heating loops are warming up, but the tiles above the 3rd heating loop remain completely cold. The building handover has already taken place, but the heating system was accepted on the condition that the heating itself works properly, while the heat distribution still needs to be assessed.

Does anyone have any ideas on what else I could try? I assume I can rule out a kinked pipe in the heating loop if I see visible flow on the related flow meter, right?

Thanks in advance,

Best regards
Mycraft6 Dec 2018 09:36
Yes, and that is why the installer of the system must first come and adjust everything before you start working on it yourself.
KingSong6 Dec 2018 09:38
He had already set everything up... precisely according to the heat load calculation. He doesn't do more than that.
KingSong6 Dec 2018 09:40
Mycraft schrieb:
Just have the heating engineer come now and fix it.

If it were that simple, the heating engineer was hired by the general contractor and is 400km (250 miles) away. Before anything happens, I first need to submit an official defect report with a deadline.
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Domski
7 Dec 2018 00:52
If nothing actually gets through there, you won't get around it. Your heating surfaces in the bathroom are probably already limited, so you definitely need flow in the third circuit.
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matte
7 Dec 2018 06:52
I am currently wondering how large the bathroom must be to require three heating circuits here. I would also contact the heating engineer, who has completely different options (such as flushing, etc.).
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readytorumble
7 Dec 2018 07:23
Although it doesn’t really matter, I would also like to know why three circles were installed there for an estimated area of under 10 m² (107.6 sq ft). The one in the middle covers barely 2 m² (21.5 sq ft)...