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Why wouldn't Brian be my real name? But Phmode isn't my real name!! I do know they have a circuit board and very flimsy, but normally reliable, micro-switches but why would I want to go replacing the whole actuator, as you suggested in the first place, or even the circuit board as you now...

Hi flameport and thanks for your reply. My router is having one of those moments so my post missed your response. Edited, having been poking around with my multimeter! So, to answer my own question posed above, it seems that what is holding the actuator in the H position with no demand for...

Hi John. Many thanks for your response. So, am I trying to fix a problem that isn't there, (other than not having any hot water yesterday morning)? Perhaps I've never noticed the actuator staying in the H (or the last selected) position before. As I said, when I turn the water on, the...

Hi and thanks for the rapid response. The valve spindle is totally free and the fact that the actuator remains in the H position, even when there is no voltage to the white wire and with the actuator removed from the valve unit, is what is confusing me. No voltage (because there is no demand)...

Hi guys. First post so treat me gently. I have a really weird problem with a Drayton MA1 mid-position valve and I can't find any reference to this specific problem. The system is a conventional gravity-fed system with gas condensing boiler, Lifestyle LP522 programmer, Drayton RTS1 room-stat...