Cold Radiators On Top Floor

I have tried bleeding the top floor radiators they all have water in.

Cold radiators on top floor.

Other radiators on the top floor are working fine. I replaced both zone valves on my ch system due to a fault with the hot water becoming blindingly hot and not being able to shut the system down via the programmer. Before you spend any more time fiddling with the thermostat. If some of your steam heat radiators are not getting hot the steam vent may not be working may not be venting at all radiator stays cold or may be venting too slowly radiator heats to proper temperature but too slowly if a steam radiator valve is open but the radiator is still cold the steam vent may not be working.

As the system refilled i walked around floor by floor opening the bleed valves so air could escape. When the heating was put on i found only the top floor 4 had hot radiators looking at previous posts here i loosened the bleed screw on pump no indication of any air and tuned all bar 1 radiator off on floor 4 one radiator got hot on floor 3 turned off the one rad on top floor 4. This is a bigger job which you may not wish to do yourself as it requires removing the radiator from the wall and rinsing it through which can be a messy and time consuming job. I also found the pressure was very low.

In some houses it may be a slight inconvenience. Note at this stage the air pressure ceased building up on the top third floor radiators so i turned the heating on turned up the thermostat and went back around the system releasing air. Make it somewhere between 13 15 and you ll be in good shape. I have tried the heating on with every other radiator turned off the top floor stayed cold.

No more it s too hot upstairs one of the most common complaints many of us have about our homes is that it s too hot upstairs or too cold downstairs. In others especially in older homes this problem may be a symptom of a more serious issue with air flow insulation or efficiency. So if the boiler is in the cellar and the highest radiator is 30 feet above it on the top floor the pressure gauge must read at least 12 71 psi when cold. Am guessing there may be an air lock somewhere between the second and third floor but any advice would be much appreciated.

I ve now topped this up and bled all radiators but the problem remains. I ve noticed now having put the heating on that 3 rads on the top floor are stone cold as are the pipes to and from the rads. This cured the problem but on re starting the system the pump started to make a noise like a howling banshee so i replaced this also.