What to Do If You Have a Radiator Not Heating
A radiator that is not heating up properly is usually caused by one of three things: trapped air, sludge buildup, or a faulty thermostatic radiator valve (TRV). If the radiator is cold at the top but warm at the bottom, bleeding it with a radiator key will release the trapped air — this is a simple five-minute job you can do yourself. If the radiator is cold at the bottom, sludge has likely settled in the base and a powerflush may be needed. If only one radiator is affected and the TRV is stuck, tapping it gently or removing the head and freeing the pin can sometimes resolve it. For persistent issues, a heating engineer in {location} can diagnose and fix the problem.
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