Thanks for that. I've took a look at the insides and when I removed the motor, the spring that pulls the valve shut fell out on the floor. One end was broken. Hope to scrounge one from work that'll fit and hopefully save myself a hefty bill.
Hi there, I have a problem with the motorised valve feeding the central heating system. The radiators get hot when HW only mode. I suspect the valve is stuck open yet when the valve is powered up, I can see the lever move over and when powered down it returns.
On the right hand side of the...