fixing a radiator that is persistently cold on the top half

Question

My radiator is cold on the top half. I've tried turning it on and off a few times but the problem is persisting. What else could I try to fix the problem?

Chris · Accepted Answer

Check if there is air in the radiator. If you have a combination boiler then the pressure will need topping up afterwards. If this does not solve the problem initially there are further issues.

Kirk · Answer

Cold at the top warm at the bottom indicates trapped air. the radiator needs bleeding.

Johnson · Answer

Has he tried bleeding the radiator, if yes and still cold at the top then close all the radiator valves in the house.

Daniel · Answer

Turn off all other radiators put heating on then slowly open the rest half way possibly boiler undersized or circulation issues

Cristian · Answer

try aerating - releasing air - via radiator bleeding point using a bleeding key

Mark · Answer

Check for leaks under floor rad is full of air if constant bleeding you will have leak !

Jag · Answer

You can try taking the air out the top of the radiator with a bleed key and close it when you get a little nit of water. dont forget to top you system back up with water after.

Steven · Answer

If you have bled the radiator and its still cold, then you must have circulation issues and possibly needing a power flush

Mahoney · Answer

Hi,

You would need to bleed the radiator for best results contact a gas safe registered engineer or a qualified plumber

fixing a radiator that is persistently cold on the top half

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