Have a guy who can come out tomorrow to look at the heating. Is it worthwhile me trying to take the motorized head off and turning the valve manually to see if it loosens up or just wait for the pro?
Many motorised valves have a sliding override that latches. It is designed to open it so you can drain the system and it doesn't go far enough to trigger the switch. But if you take the cover off and wedge a biro in while you activate the override then it does trigger.
Have a guy who can come out tomorrow to look at the heating. Is it worthwhile me trying to take the motorized head off and turning the valve manually to see if it loosens up or just wait for the pro?
Thanks to @Aroogah for the recommendation.