In an earlier contribution to this discussion,
wrote:

My mid-position valve stays powered up in the Heating position even if
nothing is demanding. Is this correct, or should it return to the
Water position using the spring return (like it does if you completly
power down the whole central heating system)?

Cheers

Paul

It seems normal for it to stay put. If you look at the Y-Plan wiring diagram
in http://content.honeywell.com/uk/homes/systems.htm you'll see that one or
other wire to the valve is receiving power under just about every condition.

The acid test is to remove all power from the heating system by turning it
off at the FCU (not the programmer). *Then* you should hear the spring
return taking it back to the HW position.
--
Cheers,
Set Square
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