Radiator Valve not controlling a radiator properly

What to do if a radiator valve does not seem to be behaving as it should. Here are the steps to check what may be causing the problem:

• If the room is BLUE on the app, the room is not calling for heat. The valve should read the set (target) temperature and it is likely that the radiator should be cold. Note that it can take up to 10 minutes for the valve to update if the room has just turned off.
• If the room is ORANGE on the app, the wireless valve should read the set (target) temperature on the app and the radiator should be warm. Note that it can take up to 10 minutes for the valve to update if the room has just turned on.
  
  
• The radiator is COLD but the radiator valve is showing a target temperature, this is most likely to be because the target temperature is set close to the measured temperature (that the valve is sensing) in the room, and though the app is orange and the wireless valve is showing the target temperature, the radiator is cold because the valve has decided that the room is close enough to the set temperature and it does not need to add any more heat to the room to save energy. This can be solved by adjusting the valve offset temperature.
  
  
• The radiator is COLD but the room temperature is significantly below the temperature displayed on the valve's screen, then the pin in the valve body (the metal part of the valve, which the water flows through) cannot open properly. This may be because the pin inside the valve body has become jammed or stuck. To fix this, remove the valve head from the radiator, and with a pare of pliers or end of a large spanner, work the pin on the valve body free. Be careful when doing this as if the valve body is in poor condition, it may cause the valve body to leak. If it's not possible to free up the pin on the valve body, it will need to be replaced. Once the pin is free, remount the valve head.

• The radiator us HOT but the radiator valve is showing a target temperature of 4 or a lower temperature that the room is at, this means that the wireless valve cannot control the water flowing into the radiator and this may be because of the following reasons:

• • The valve body may be corroded inside, which means that the wireless valve cannot push the valve shut. This means that the wireless valve needs to be removed from the valve body, and with a pare of pliers or end of a large spanner the pin on the valve body needs to be worked free. Be careful doing this as if the valve body is in poor condition this may cause the valve body to leak. If it is not possible to free up the valve body, then it will need to be replaced. Once the pin is free, remount the radiator valve. See the video above for how to remove and refit the radiator valve.
    
    
  • The radiator valve may be cross threaded onto the valve body. This means that the valve cannot push down on the valve body effectively. To rectify this the valve needs to be removed from the valve body and remounted. See the video above for how to remove and refit the radiator valve.
    
    
  • If the valve body is the Danfoss RA-FS type, some times the grub-screw that is tightened up with an Allen key is not tightened up enough, and the white adapter ring rises up the valve body; you will see a small gap under the adapter ring. This means that the wireless valve cannot control the pin properly in the valve body. The wireless valve head needs to be put into mount mode and then mounted onto the valve body, so that the white adapter ring is tight up against the valve body. See video below for how to remove and refit the radiator valve on the Danfoss RA-FS valve body.