Originally Posted by KSA-Cossie
Originally Posted by Steve the Plumber
Have the non heating up rads have thermostatic rad valves (trv) fitted?, if yes then try to unscrew the trv head only and push the little pin which is now exposed on the trv body in and out GENTLY, wait a couple of seconds and the pipe leading to the rads may start to heat up.
If not balance the system may need balancing?
How does the plastic head come off ?
Just below the plastic trv head is normaly a chrome lock nut type thing, use some adjustable grips to undo.