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My radiators are not heating up?

Only one radiator - upstairs- is heating up, I have drained all the air s far as i can see,I have tried isolating each rad but no success, I drained one rad and it started to heat but when i closed the valve again it cooleddown andwillnot heat up.

andy
June 2007
Heating, Home Heating SystemsHeating Radiators System
what type of system have you ?
is it the closest rad to the pump thats getting warm ?

need more info

hi-spec plumbing
June 2007

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Radiator Not Heating Up - Troubleshooting