Radiators upstairs cold hot downstairs?

[transam]

Thanks transam. It was just the actuator. I followed the previous wiring - all the wires (blue, brown and orange) from all actuators were in the same terminals. Only separate one from the actuator was the grey. May be that the room stat live brown is not seated well/correctly in the terminal. Will have another look. Thanks.

in which case the valve (body) is not shutting completely and needs replacing is my guess

 

[mitch66]

Check to see if the spindle is stuck. New valve is best way if it is. Check if actuator operates correctly when it's off the valve. You should know which way to go then.

 

[TimboTwo]

Thanks transam. It was just the actuator. I followed the previous wiring - all the wires (blue, brown and orange) from all actuators were in the same terminals. Only separate one from the actuator was the grey. May be that the room stat live brown is not seated well/correctly in the terminal. Will have another look. Thanks.

You have the wiring wrong - the brown should be separate, it is the motor control from the thermostat.

 

[Dangee]

As above but you can “ease” the spindle. If they have been stuck in the open position for a long time, debris can make it stiff to turn.
Take the head off & see if it works correctly from the room stat

 

[Dangee]

All mot valve connections join with each other except the brown which is the switch live from whatever thermostat it’s controlled by. Call for heat on brown then livens orange after 6 or 7 seconds. Once satisfied, brown loses voltage & de powers orange (boiler swl)

 

[Rich Kellett]

Thanks everyone. I’ll go have another play around.