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Thanks Stem - time to call in the cavalry!

The lever moves freely with no resistence. Boiler replaced approx 6 weeks ago and system drained down to fit a drain tap to the CH system and recharged approx 2 weeks ago. I believe the system worked ok untill a couple of days ago when I noticed the rads on when they should not have been.

Heating has started coming on whenever HW is active. From what I read, a problem with V4073A suggests itself but was looking to see if anything obvious outside of this before I call in a plumber.

Trying to make sense of Drayton Digistat 241 with Danfoss RX1 controls to Honeywell V4073A motorised valve. HW Off pin always seems to have 230v up no matter what state the system is in. Grateful for any advice!