ZA5 manually move to B position

[CrystaKen]

I have a 2 way Drayton ZA5 and if I move it manually the farthest it will go is mid-point (which doesn't engage the heating). The only way I to get it fully to the B position is to take it off of the wall and use a screwdriver then lock it in place. Am I missing something? I have 2 and they both behave this way.
The reason I'm doing this is because my Nest control unit has died, so will have to to operate manually until they come out.

 

[Deleted member 267285]

Link your terminals at the heat link, manually moving them only touches the microswitch briefly, it’s for filling purposes not to override. Does the nest heat link override not work either?

 

[CrystaKen]

No, the power / life to it has gone completely, no lights, nothing.
Is your solution still possible? How do I do that, cover off job?

 

[Deleted member 267285]

Yes it should be. Which Nest do you have? Also are these for heating and hot water, or both heating?

 

[CrystaKen]

3rd Gen. Just for heating, I'm using the emersion for hot water although the Nest can do it. Maybe easier to stick to the screwdriver method. I just wanted to check that there wasn't a simple way to do it with the manual lever.

 

[Deleted member 267285]

Jamming a screwdriver in might damage it, or not work or both. You could always link the orange and grey wires in the wiring center?

 

[CrystaKen]

Cheers, in the ZA5 or in the Heatlink? I'd have to connect / disconnect everytime I want the heating off / though wouldn't I?

 

[Deleted member 267285]

Yes either where the wires terminate from the za5 or at the heat link. You could use the boiler thermostat until you have a new nest, or if there’s another on/off switch?

 

[CrystaKen]

Urgh, the boiler is outside, it's an oil one, so I have no thermostat, that's what the Nest does. Thanks for your help, I'll figure something, I just wanted to check there wasn't an easy way to get it to go all the way to B position. ****ing about with wires before Christmas, my Wife won't be happy. I think screwdriver method is my best option tbh. Worst outcome I have to spend £50 on a new ZA5, ultimately it's doing what the manual lever does (just winding a bit further).

 

[CrystaKen]

Actually, you gave me a 'duh' moment. I can just lock the ZA5 on, make sure the valve is open and then yeh, use the power switch to the heating system to turn it off and on, that way no wear on the ZA5 motor (or yammimg screwdrivers in it) ...thanks