jyax said: Hi all, I've got a bit of a head scratcher with 3 cold radiators downstairs that are full of water. Radiators upstairs are heating up nicely, as are another 2 downstairs that are fed from above. There are two drain points - 1 in the hall on a falling pipe (which drains upstairs) and 1 in the kitchen which drains the three downstairs.. Cold radiators downstairs can demonstrate a balancing issue. Hot water tends to rise upwards in a system, so you'll know you have a balancing problem if your downstairs radiators are cold and the upstairs ones are hot. If this is your issue, go to the radiators upstairs and close the lockshield (the smaller valve at the opposite end to the.

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How to fix cold upstairs radiators. Refill the cistern, making sure there is enough room for the water to expand when the system heats up and that there is enough to float the ballcock. When the system is cold there should be just enough water to make the ball float and switch off the water coming in.. If the downstairs radiators stay cold while the upstairs ones are hot, then you've got a balancing issue.. You can try to go to the radiators upstairs and close the lockshield (the smaller valve at the opposite end to the thermostat) then open it a quarter turn.. If your radiator is cold at the bottom and hot at the top,.