COLD RADIATOR

[razor066]

HI THERE CAN ANYONE HELP PLEASE. I BUILT A NEW EXTENSION PUT A NEW RAD IN THERE BUT IT DOES NOT GET WARM,HOT PIPE ON THE FEED SIDE COLD ON THE RETURN.FLUSHED RAD OUT NO SLUDGE IN RAD,TURN ALL RADS OFF APART FROM THE COLD ONE THEN IT GETS HOT .BLOWN WATER DOWN RETURN PIPE THIS MORNING NO BLOCKAGE .
ddont NO WHAT ELSE TO DO .....RAD VALVES JUST STANDARD NOT TRVS ALL OVER RADS HOT....THANKS IN ADVANCE

 

[JohnD]

If you have in some way established that it is not sludge, and that the taps are open at both ends, and it does not need bleeding, then I expect that the way you have added the new pipes means that the new rad does not get enough flow and the circulating water is happy to go round the old rads.

Try closing some (or all) the old ones and see if the new one gets hot.

If it does, then balance the system (see FAQs in the Plumbing section)

If it doesn't then you may have plumbed it wrong.

BTW turn off your CAPS LOCK.