1 cold radiator

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I too have the exact same problem. One radiator on the ground floor is stone cold but all the others including the ones upstairs are all ok. If I turn all radiators off except for the offending one, it heats up. I proceed to turn all the radiators on one at a time; the radiator stay on up until the last radiator is turned on then it goes off again. I've done the usual radiator bleeding; I've removed the radiator and checked for sludge.
What to do?!
 
I went to my pump and noticed that of the headings- central heating, both, hot water- the indicator was pointing to hot water. Having moved the indicator to 'central heating', the radiator has come on. I'm going to wait until it heats up fully before sliding the indicator to 'both'; I want to relish all the radiators being on at once.
 
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That's either an airlock or a balancing problem, or as your other post suggests you suspect, sludge.

Balancing can be a problem if there's no way to restrict flow into the hw cylinder.
 

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