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Hi,
About 8 years ago my late father (was more knowledgeable on plumbing than me) and I fitted central heating into my house. I used old cast radiators throughout which I spent many hours sourcing and cleaning out etc.
All was fine until this winter when a large ground floor radiator is failing to warm up. The vertical pipe up to the lock valve does eventually gets hot and the rad may get the very slightest bit of warmth in it (radiant heat?). The pipe leading away from the thermostat remains cold.
I have followed previous threads advice and have ended up replacing the thermostat, checking operation of the lock valve which is ok and taking the rad outside and flushing it through. When draining the rad the water is very clear and there was no muck at all inside. I have also switched off all the other rads and just left this one going for a few hours with no luck.
I'm guessing some form of blockage / air lock after the thermostat but have my doubts as I accidentally turned the thermostat on when removing the rad and water poured out.
Any ideas please?
Thanks, Andy.
About 8 years ago my late father (was more knowledgeable on plumbing than me) and I fitted central heating into my house. I used old cast radiators throughout which I spent many hours sourcing and cleaning out etc.
All was fine until this winter when a large ground floor radiator is failing to warm up. The vertical pipe up to the lock valve does eventually gets hot and the rad may get the very slightest bit of warmth in it (radiant heat?). The pipe leading away from the thermostat remains cold.
I have followed previous threads advice and have ended up replacing the thermostat, checking operation of the lock valve which is ok and taking the rad outside and flushing it through. When draining the rad the water is very clear and there was no muck at all inside. I have also switched off all the other rads and just left this one going for a few hours with no luck.
I'm guessing some form of blockage / air lock after the thermostat but have my doubts as I accidentally turned the thermostat on when removing the rad and water poured out.
Any ideas please?
Thanks, Andy.