Mystery cold radiators

Joined
4 Dec 2015
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United Kingdom
Hi, I have 5 radiators in the house. Just recently the radiators in the bathroom and the dining are cold when the ch is on. I have bled the radiators. Turning off the working radiators forces the cold ones to work. I can then turn the other radiators back on and the whole set up is working. However, the next day after the heating has been off all night, the 2 problem radiators are cold again. Don't know what to do now. The bathroom radiator is a vertical towel rail and is the only one that has a temperature controlled valve that is working correctly. Can anyone shed any light on what I can do please???
 
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Basically you turn the lockshield valves on the radiators off, and then on a bit - often one turn is quite enough.
This forces the hot water through the radiators that are struggling, as water always likes to take the easiest route around a system.....hence closing the lockshields provides a restriction.
John :)
 
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But John, is that with or without PPE gloves ? ;)
 

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