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Ok, maybe I wasn't too clear. When I say it is either "on or off" what I mean is that if it is set to [say] "1" on the TRV then the radiator never "shuts down" and regulates the flow like all our other radiators. The only way to shut it down is to turn the TRV to the "0" position. The net...

I have a radiator with a faulty TRV - it's either fully on or fully off. The name on the valve head is "Europa" with the only other information being "42" and "EN215". I suspect that the valve head is faulty rather than the valve pin being stuck within the valve itself (since it can be...