/ Why Isn't My Radiator working?
Keen to get this sorted before the full onslaught of the festive season hits.
Have you had it working before? If not then try closing the valves, they might have been put on wrong. (Actually, even if you've had it working before, try closing the valve, it might have been put on wrong but you don't remember (who remembers these things?)).
Still not working?
It's buggered, mate. Need to fit a new one.
Try turning all the other radiators off to see if the heat comes through to your radiator thats playing up.
If you've only just turned it on for the year, it might be clogged up with rusty sludge... if so you need to take it off the wall (remember to make sure the heating pump is isolated), take it outside, shake it around and run a hose through it till it runs clear.
1)It may need flushing as it is full of sludge - take it of and flush with a hose, if the system is a closed one you'll need to top it up after refitting.
2)System may need balancing. Turn off all the other radiators and see if it gets warm then. The water in the system will always take the path of least resistance and if the pump is on the small side for the system you may need to restrict the flow in some of the other rads in order to force more through this one.
Note I'm not a plumber although I did install our CH system several (problem free) years ago. Advice taken at your own risk and all that . . . :-)
Since you told us that the pipe leading up to the radiator is “boiling hot” but the radiator is cold then balancing or heat availability isn’t the problem. The problem must be that the hot water is not getting to the radiator – you have a blockage somewhere. You’ve checked the valves are both in the open position so the next thing is a sludgy blockage as suggested above. Try turning all the other radiators off, and run the heating to push all the water through the one blocked radiator; tapping it with something while the system is running will help dislodge any sludge.
If that doesn’t work then either the blockage needs stronger tactics to move or is somewhere down the pipe work on the return side, not the hot side.
You should also flush out the system if you move a blockage and get the radiator working.
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