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Just a quick update (it's now approximately 2 months after spraying the micro-switches with contact cleaner): the V4073A has worked perfectly every day since! Result!

"so I feel certain of how to interpret the reading" -> "so I feel uncertain of how to interpret the reading" (I can no longer find the "edit" button) :-(

I *do* like this forum system, but it does take a little bit of "getting-used-to" at first! :-) Yes, I'm aware of that. But since moving or touching anything has "temporarily fixed" (irony alert!) the problem twice already, I'm inclined to just spot-probe potentials/voltages if that provides...

Ooops -   my bad!

Ok, I have a question for anyone who can interpret circuit diagrams. Looking at that internal schematic diagram           on the DIY FAQ page, am I correct in saying that: *if* 1) I have ~240V AC on the white input (CH ON), *and* 2) I have ~240V AC on the grey/gray input (HW OFF), *and* 3) I...

Yes, when I remove the actuator, I can turn the valve spindle freely by hand. I haven't measured the angle of rotation, but "off the cuff" I'd say it was only about 15 to 20 degrees - does this seem "correct" for one of these valves? (I'll grab the protractor and some adjustable pliers tomorrow...

My apologies - I've been calling the actuator the head. Yes, it does. The whole system works perfectly for a day or two (including being able to select CH), then it seems to get stuck on DHW only i.e. selecting CH does nothing, and selecting CH+DHW only seems to make DHW work. I can temporarily...

Hi all. I've got a Y-plan fully-pumped central heating system, but when the controller calls for CH, the synchron motor (in the Honeywell V4073A mid position valve) is not moving the valve round (and hence the boiler is not firing). I''m getting ~240V AC at both the white (CH ON) and grey (HW...