Hi anyone ideas on this. Central heating installed 20 years ago all fine up till last week. The radiator in one of the bedrooms is cold and copper pipe leading to rad cold too. The other 2 bedrooms the rads are working fine. Rad doesnt have thermostatic valve.
Before you go through all the trouble of the post above.
Close off all working rads except the one that is cold and if it's a pumped system turn the pump speed up to try and clear a possible airlock/blockage.
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