Radiators Are Hot Downstairs but Cold Upstairs Cause: This could be caused by a blockage in the ball valve, or if there is a lack of water in the feed or expansion cistern. Quick Fix: Check the ball valve and expansion cistern for blockages, and bleed the radiator to remove any air that could be causing issues.Click to see full answer. Also to know is, why are only half my radiators working?2. Check for Trapped Air and Bleed Your Radiators. If just one (or a few) of your radiators aren’t heating up, the most common reason for this is trapped air. If you’ve just turned the heating back on after the summer, air can become trapped in your radiators, causing them to be warm at the bottom but cold at the top.Also, why are my radiators cold when the heating is on? If the radiator is cold at the top and warm at the bottom it could be a case of having a trapped air bubble. When a central heating system is signalled to switch on, it sends hot water to radiators. If the top half of the radiator is warm but the bottom half cold it usually means a sludge problem. Accordingly, should you bleed radiators upstairs or downstairs first? If your home has 2 floors you should begin bleeding the downstairs radiators first. It’s also advisable to start with the radiator which is furthest away from the boiler. Once you’ve bled all the downstairs radiators you move on to the upstairs, again beginning with the radiator which is furthest from the boiler.How do I balance my heating system?To balance your central heating system, turn off your heating system and allow all radiators to cool down. Open both of the valves for all of the radiators and turn on the heating. You may need some help but you now need to go to each radiator and work out when they heat up and what order they heat up in.
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