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Some more info: see attached an infrared picture of one actuator / flow valve working (to the left) and the one not working (to the right). It looks like the transparent flow valve is blocking the flow (warm water on top, cold water at the bottom). Is that possible? What would need to be done...

Thank you both. I rent the property so I will need to escalate to the owner. Re: actuator, I was hoping to be able to unstuck the pin myself for the circuit that remains cold but it looks too risky (and the zip tie does not inspire confidence). 3 out of 4 seem to be working ok so unlikely...

hello, My flat has a combination of underfloor heating (4 zones, 3 thermostats) plus some radiators in some rooms. Regarding the underfloor heating, one zone heats up fine, 2 other (same large space) heat up slow, and 1 does not heat at all. I identified the pipe on the manifold and it stays...