Are you having an issue with your radiator? You will be pleased to know that it may be possible to fix the problem without a professional. What can you do to fix a radiator that isn’t working?
Check the lock shield.
If one of your radiators are not working, first thing you need to do is make sure that the lock shield is open. To the left you will see an image of what a lock shield typically looks like, it will be found under a cap next to the radiator. To make sure it is open, turn it all the way you can anti-clockwise.
If this has not solved your problem, you may have air in your radiator. A common symptom of air in the radiator is if you can feel that both flow and return pipes are hot as well as the bottom of the radiator, but the top is cold. This is always a sign of air stuck in the radiator. To solve this, you will need to bleed the radiator. It is highly recommended that you turn the boiler and pump off before trying to bleed the radiator.
To bleed the radiator, make sure both pump and boiler are off and both radiator valves are open. Put a small towel under the bleeder valve or screw and open the screw to let the air out. Once water is coming out and no more bubbles, let it run for a few seconds and the close the valve/screw.
If this does not fix your problem, the next place to look is the Thermostatic Radiator Valve (TRV). The valve could be stuck shut . If this is the problem, it may need to be replaced.
Checking the TRV.
The first thing you need to do is make sure that it is fully turned on. Now you need to remove the TRV head. How this is done will depend on the valve, some have a screw on collar, some will have a black plastic lug which you need to pop a screw driver into and turn to remove. There may also be other ways. Once the top is off, you should be able to see the valve. Now you can push down on the pin to see if it is stuck or not. If it moves up and down, it is not stuck. Do not hit it with a hammer, especially if you have an older pin type head. What you need to do is get a set of long nose pliers and wiggle the pin to try to release it. If you are successful, the pin should come back up. If it has returned, try to push down on the head again and see if it returns. If not, you need a new TRV.