"This valve actuator is a direct replacement for British Gas BGM-VSP23 (which incidentally is made by Drayton for British Gas, with the signature blue case).
When this fails, central heating and or hot water will run continuously, even when timer or thermostat says otherwise. Feeling hot , hot, hot!
Very simple to fit- 5 wires with same colour coding as original- just be sure to isolate power supply to boiler first.
Once wired in, valve actuator simply clicks into place on valve body- check that manual level is locked into right hand side position (recessed) first though, otherwise damage can be caused to the actuator. Part is shipped with manual level already in correct position for installation though, but always worth checking. Once powered up, lever will then move to whatever position it needs to be in, driven by boiler controls.
Great quality part, but not sure why price is £22 more expensive for this mid position actuator than the 2 port variant.
A quick and easy fix which got me out of a tight spot late on a Friday evening- Screwfix to the rescue again!"