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The stat is in a ridiculous place behind a bed, so it's easier to do this at the bathroom junction box. Plus it's two floors down, so in the bathroom I can immediately check the valve operations. 

The official documents for this valve also say:    "Manual lever for filling & draining the system"  so I am not using the lever as intended. It may be a deliberate design to stop the lever moving far enough to operate the microswitch.

Honeywell V4043H1056 V4043H1056 Normallyclosed,    22mmcompression. SPST endswitch.6.9KV.   0.55bar  maxdifferential pressure

NozSpark, thank you very much for that gem of information... finally I understand why latching the lever did not immediately fire up the boiler.  The boiler was only getting its signal when the HW zone valve motored open.  This valve is working fine under the control of its thermostat. It also...

Thanks, KME, I understand all of that, but I don't understand what exactly is going on since I latched the CH zone valve open. I did that so that I could eliminate the roomstat from my enquiries and also the zone valve motor.  So, with the valve latched open (and therefore its microswitch...

I have a Glow worm 100 FF about 12 yrs old, 2 Honeywell V4043H zone valves (installed a couple of years ago), a pump always set to its fastest speed.   The boiler wouldn't start 6 days ago. In the few days before this I had heard, rather more often than usual, the sound of a zone valve doing its...