Check the valves
Make sure the thermostatic valve is turned up and the valve at the other end – the lockshield – hasn't been closed. A thermostatic valve can also stick: under the head there's a small pin that can seize in the closed position, especially after summer.
Other common causes
If the valves are open:
- Air trapped at the top – bleed it
- Sludge blocking the bottom
- The system needs balancing, so nearer radiators take all the flow
- A blockage in the pipe to that radiator
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When to call an engineer
If bleeding doesn't help and the valves are open, a heating engineer can check for a stuck valve pin, blockages or balancing issues.
