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I have 1 cold rad in a downstairs cloakroom.
I have flushed it, tested the valves ( not trv ) and connected a hose from the o/side tap to each valve to blast any air-locks.
I have turned off all other rads and it still won't work.
I have replaced rad with a length of 15mm pipe and the pipe gets hot immediately! Put a new rad back on and it works for 2/3 days then fails.
If I draw 1/2 a bucket from the return pipe, hot water is drawn thru the flow pipe and the rad works for 2/3 days.
I know it could be a blockage, either air or sludge, but how come I can always draw hot water thru if I drain from the return pipe?
It seems as if there is something stopping the free flow thru the system which I can by-pass by encouraging the flow when draining.
I would be interested in advice as to what should be my next step.
Someone must have come across this before!!
Thanks

Let's go again!

500 posts before xmas :santa1:
 
i have a radiator in the dining room that never gets warm???

i think its because i disconnected 2 years ago and have never been bothered to reconnect it, but im not sure :)
 
Can you not fit wireless radiator valves? Surely that would do the trick.
 
Can you not fit wireless radiator valves? Surely that would do the trick.

funny you say that, i once got into a argument with a council tennant because after id fitted his new radiators i wanted to run pipework to them and he insisted that he wanted infra red radiators and no pipework :(

he never managed to tell me where you get infra red water from LOL.
 
Don't mind me while I bump some threads in the plumbing forum category. This thread might not be a current topic, if it isn't, just let it drop off the list.

If you DO want to reply to it, go ahead, that's fine. Your post might add some value to the thread and help newer members in the future.
 
Don't mind me while I reply to a few of the threads. We need the new thread pages to be picked up correctly. If this thread isn't current, just visit the plumbing forum and post your own new thread or checkout the other existing threads.
 
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