Radiator / heating symptoms / radiator circulation
Why is my radiator still cold after bleeding?
Start with the observable symptom. This page explains possible causes; it is not a diagnosis.
If bleeding did not restore heat, trapped air may not be the main problem. Check the controls and system pressure, then arrange an engineer to assess circulation, balancing, sludge or a valve fault rather than repeatedly bleeding the radiator.
Start with the pattern.
The radiator remains cold or uneven after air has been released and the valve closed.
Possible causes, not a diagnosis.
- A valve is stuck, closed or not receiving the correct control signal.
- Sludge, balancing or circulation is limiting flow.
- Bleeding has reduced boiler pressure or the system has another fault.
Check what is safe to observe.
- 01
Check the radiator controls and boiler pressure against the manual.
- 02
Compare the temperature of the two pipes and of other radiators.
- 03
Look for leaks or water around the bleed valve and radiator valves.
Take the smallest useful step.
- Stop bleeding and use only normal user controls.
- Follow the boiler manual if pressure needs a safe check or approved top-up.
- Record which radiators work and which do not for the engineer.
- Do not repeatedly bleed or top up a system that loses pressure.
- Do not remove a valve or flush the system yourself.
- Use a qualified heating engineer for persistent cold output or pressure loss.
- Report it promptly to a landlord or housing provider when the home cannot be heated properly.
Professional requirements and rental responsibilities vary by location. Use the qualified local professional or housing authority that applies where you live.
UK example: Gas Safe RegisterWhy this page says that.
This page separates an observable symptom from possible causes and keeps the recommended action within a safe household boundary.