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The thermostatic valve of my radiator is blocked open; how to unlock it?

It is often enough to "tap" the body of the device with the back of a wrench to unlock the valve. If the model is suitable, disassemble the head (it is often enough to act on a ring and rolled back and forth several times the small control rod.If it is a problem of expansion capsule, try to do react by heating (moderately) the body of the faucet with a hair dryer.If nothing is done... You will only have the solution to change it (some models can be replaced without emptying but it is not always the case).

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Video Instruction: How to fix a thermostatic radiator valve if your radiator is not heating up.