In an earlier contribution to this discussion,
Ed wrote:


Sure as can be, Synchron has only two wires, both disconnected, +
orange white and grey for good measure, stays put on AB until you shut
off at the FCU, then instant smooth spring return. Anyone for an
exorcism?


Well I'm sorry, but something *is* still connected! If the actuator is
*totally* disconnected from everything, turning off the FCU can have no
possible effect on it.

Tell us again where you are making the disconnections. The actuator should
have a 5 core cable going to it, with the opposite ends connected into a
junction box as per Y-plan in
http://content.honeywell.com/uk/homes/systems.htm

The synchron motor is an internal component inside the actuator. Have you
been disonnecting the internal wiring inside the actuator or the external
wiring in the junction box?
--
Cheers,
Set Square
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