"The indicator on my old one was stuck on W for hot Water, and wouldn't move when the central heating thermostat was cranked up to max- not even to the Midway position. So I took the actuator off by pressing the small button on the back and lifting it clear. This gave me access to the actual valve spindle - which moved easily in both directions, just by finger-power. Don't be misled by the very limited rotation of only about 45 degrees. This is apparently normal, and does not indicate a fault within the brass valve body itself. I fitted the new actuator to the valve and swopped over the wiring - one colour at a time. The new actuator comes with the manual lever locked into the correct position for alignment. This is supposed to automatically release itself upon powering up, but failed to do so. But by seeing how it worked on the old one, I was subsequently able to release it myself without causing any damage. Anyone with a modicum of electrical experience should be able to replace this component with only two things to bear in mind: 1) Turn the power off first! 2) Ensure you tighten the screws properly again in the terminal blocks."
"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!"
"My gas boiler was sometimes continuing to remain on even with the timer controls off and the hot water was getting extra hot. Research online showed the likely culprit to be the 3 way valve. The wet side was fine as the valve could be turned the 45 degrees with ease. The actuator seemed stiff. Screwfix was first choice for a replacement in a hurry. A quick job to fit the new actuator after noting where the coloured wires went. Job done and everything working fine now. Too early to say how reliable it will be hence 3 * for reliability."