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thanx for a reply, i'm aware of the cold issue on trv's but i thought that when i'd removed the head of the valve there would be a way of tightening the valve shut. The pin which is left there obviously goes up and down and the 2 nuts below it can be undone and remove the pin completely - do you...

I have recently removed a radiator which is trv controlled, during this the low pressure warning light appeared on the boiler and i could not get hot water or switch the heating on. The trv was removed but i couldn't see where i could totally close off the valve. Its a terrier valve on a combi...