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I've just had a talk with him. He claims they didn't touch any of it, but believes that one of the guys may have accidentally swapped the flow pipes on the boiler side after they finished moving the radiator. That... would explain a lot, especially if that one and the three cold ones are on a...

I finally figured it out. After I ran the system with all the TRVs off, it finally started working. Then I put the TRVs back on and the problem came back. I then started opening and closing the individual TRVs until I found the culprit - the bathroom radiator (the one that was moved from one...

The one in the bathroom? No. It's the one closest to the boiler and works fine.

Everything worked fine. I don't have any pictures of the pipework, though.

Sorry, my bad; I hope this is clearer: 1) On a working radiator, when the TRV is closed, the twin pipes at the bottom and the pipe going to the TRV still get warm. 2) On a non-working radiator, when the TRV is closed (or even open), all pipes remain cold. In other words, it's as if the hot...

I've been tapping like crazy for the past 15 minutes to no avail. Again, on the working radiators, the pipes coming out of the floor get warm even when the TRV is closed. Is it possible the buildup is elsewhere (between the last hot and the first cold rad)? Also, could it be that some air got...

Nope, none. Did exactly as instructed. Added .5 bar of pressure, removed the TRV from the first cold radiator, bled it until I had about .5l of water in a jug. The water was cold, the pipes too. Checked the boiler - lost about .5 bar of pressure after bleeding.

I have.

The only zone controls I have are via the smart TRVs. They are all connected to one wall thermostat that controls the boiler.

I have. The pins appear to be fine. What is odd is that, on the working ones, even with the valve closed, the two pipes at the bottom will heat up (but not the radiator itself). The pipes on the other ones are ice cold.

It's a Danfoss RA 23 mm with notches. I couldn't find much information on it. The head is a Tado smart TRV. Tried that. The cold ones remain cold.

I have a combi boiler with 7 radiators in the apartment. When I turn the heating on, only 4/7 get hot. The remaining 3 are completely cold. It's as if there's something blocking the flow between radiators 4 and 5. I've bled the radiators (hardly any air came out) and restored the pressure in...