We have oil central heating, supplying 11 rads in a bungalow. The boiler is situated centrally in the house. All rads are fitted with thermostats. When we moved in about 4 years ago all rads worked fine. However, each autumn/winter since, when we have put the heating back on, some rads have not worked. Was advised by a friend to knock the pipes feeding the rads and this worked on some but not others. All rad thermostats show they should be on. Rads that are not working are situated at varying distance from the boiler, some close, some further away. Currently 4 rads not working. Any suggestions?
Thermo rad valves are prone to sieze, even if they look to be in the on position they very often are closed, remove the thermo valve head if the brass plunger below does not move or show 1cm of its lenght you can try gently to encourage it to move with pliers or grips, with the thermo head off the valve should be in the open position allowing the hot water to flow, if the valve works after removing the head its a simple matter of changing the head of the valve, if not you may need to change the complete valve which will require draining and refilling the system
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