Zone valve: jumps out of override position

mike004 · Wednesday at 2:33 PM

Can a motorised zone valve, locked into override position, "jump" out and return to the default position?
When I set the valve into override, it works as expected. I get HW + CH from the boiler.
But when I turn off the boiler, the valve lever seems to return to the default position.
Surely the lever is physically locked into position when you move it into the override position?

denso13 · Wednesday at 2:40 PM

Some automatically release, return to default, when power is applied/disconnected.

Exedon · Wednesday at 3:00 PM

As above honeywell valves un latch when powered up.
Danfoss and eph stay open and also make the micro switch in manual position.

mike004 · Wednesday at 3:23 PM

My zone valve has been in the override state for over 10 years.
But near the valve, in an old cardboard box, is what looks like a motor!
Could the zone valve have been installed without a motor in "override mode only". And with the passing of time, the override position will not hold?

gas112 · Wednesday at 4:21 PM

if its a metal lever put a little bend in it that way it will usually catch again on the way back

CountryFan · Wednesday at 8:19 PM

mike004 said:
My zone valve has been in the override state for over 10 years.

Would be easier to remove the head and link the 2 switch wires.

mike004 · Thursday at 9:18 AM

CountryFan said:
Would be easier to remove the head and link the 2 switch wires.

What colour are the switch wires?

CountryFan · Thursday at 9:23 AM

mike004 said:
What colour are the switch wires?

Usually orange and grey

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Zone valve: jumps out of override position

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