Honeywell Sundial Y plan - no resistance to manual lever

[coozybones]

My HW comes on no problem but my CH only comes on for a few minutes then turns off. I've checked the stat and all is good there, so I'm thinking its the valve and its sticking.?

The motor in the valve seems to work as when I turn the HW off from the programmer I can see the valve (cogs and all) moving.

When I try and move the manual lever either from manual to auto or vice-versa there is no resistance at all. (I'm sure there should be resistance one way at least?).

So is my thinking correct that the valve is likely to be sticking? and if so can it be unstuck? or does it need to be replaced?

I've uploaded a picture of the Valve and the back plate showing the model for reference.

Honeywell Sundial Y Plan valve

• coozybones
• 26 Sep 2010
• 1

Honeywell Sundial Y Plan valve case

• coozybones
• 26 Sep 2010
• 1

 

[mysteryman]

Your motor is running full travel, which is the central heating only position. Possibly the end switch has failed or there is a wiring error. You may need to select both hot water aand central heating on for this to work.

Look in FAQs.

 

[coozybones]

Thanks Mysteryman. No matter if I program CH or HW on or both on from the programmer I do not get CH working for longer than a few minutes.

I'm not sure what an "end switch" is?

We going to be replacing the programmer and the stat soon anyway, but wanted to first get CH working first?

Could the valve need replacing? Why is there no resistance on the motor?

 

[D_Hailsham]

If there is a small bump on the cover you removed, then the actuator (electrical part) can be separated from the T pipes.

See How a mid-position valve works for diagnostic info.

 

[coozybones]

yes the case for the actuator case has a small bump.

Can the actuator be removed without having to drain down system etc. Is it easy to do (and then check the valve spindle and WD40 it)?

thanks.

 

[D_Hailsham]

yes the case for the actuator case has a small bump.

Can the actuator be removed without having to drain down system etc.

Yes. That's the whole idea of the removable actuator.

Is it easy to do (and then check the valve spindle and WD40 it)?

Yes.