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The thermostat swivels round and has no effect on the temperature. The radiator is always very hot. How can I replace the thermostat?

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Could you post a picture of the thermostat? You'll probably get better advice that way. – GdD Nov 21 '12 at 13:00

Thermostats usually unscrew by hand with a small plastic thumbwheel at their base. Yours may be broken or have come unscrewed. Replacement thermostats are quite cheap, about £10 - £20 GBP and should screw directly onto the metal valve.

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