ᐅ Issues with underfloor heating in one room

Hello,

One of the rooms on the ground floor of our house is clearly not being heated by our underfloor heating system. The thermostat and the actuator on the manifold both show activity. Before I contact a heating company, I wanted to ask for your advice to see if there might be something I can do myself.

Best regards,
Free

Which room is it?

How was it determined that there is no heating, and what do the thermostat and the actuator indicate?

And what does the heating circuit distributor indicate? Is there any flow at all?
Please show some pictures.
Is ERR active?

Mycraft schrieb:

Which room is it?

How was it determined that the heating is not working there, and what do the thermostat and actuator indicate?

The home office. Well, you can notice it compared to the other rooms. We also have a thermometer placed there (19°C (66°F)).
Our thermostat is analog, adjustable in 6 levels. A red ring (active) is visible on the actuator.

driver55 schrieb:

And what does the heating circuit distributor show? Is there any flow at all?
Please share some pictures.
Is the ERR active?

How do I determine the flow rate? Attached is a picture of the heating circuit distributor (HKV).

If the pipe is warm, you have flow.
Are you sure that all rooms and thermostats are correctly labeled? In our office, quite a lot was done incorrectly. One problem was that the thermostats were controlling the valve for the neighboring room...