If you have already bled your radiator and find it is still not working then here are some simple things to try. If just one radiator feels slightly warm, then there is nothing wrong with your boiler. This is usually due to air in the system.
Radiator warm at the bottom but cold at the top.
First lets look at the possible solutions when all of the radiators are not working.

Make sure your heating is turned on and that the room thermostat (if there is one) is turned up and calling for heat.

If only one radiator is not working , scroll down further for possible solutions.

Below are the possible mechanical checks you . Are your radiators cold even though your boiler is working? Can you solve the problem yourself or do you need professional help? Turn the radiators up to maximum. If you have tried bleeding and checked the lock shield valve is fully on at the other end of the radiator , then chances are your thermostatic radiator valve is stuck in the off position.
This simple fix shows how to quickly .

















