Thermostat stuck in Zone 1

[JoeCastor]

The thermostat in our new (to us) '11 Ellipse will not change from zone 1. The thermostat was replaced this week, but no change.
Has anyone experienced a similar issue and can you suggest a direction to look at next?
Thanks in advance
Joe

 

[Ranger Smith]

We have the same problem with our 2012 Tour. It will select zone 2 sometimes and sometimes it won't. Was on phone with factory tech's for a month at various times. Thought it was a broken signal wire. Daisy chained them on the roof . . . No success.
Changed T stat . . . No success, They even sent me a new control box for the unit on the roof . . . no success. They seem to think there is some electrical interference in the rig affecting the signal line. I was gonna try some chokes next on it but have not got that far. On mine if you let the tstat sit for like 1 secs and push zone 2 it will go to it and you can adjust as needed. I just live with it for now.

Did the new Tstat get programmed properly??

 

[JoeCastor]

I didn't reprogram the new t-stat. I was told(by dealer tech) to make sure all power was off before beginning; turned off house and chassis disconnects. Installed per instructions. Then turned power back on. Was told that system would reset the new t-stat. It will cycle through the various heat options in zone 1, but won't change zones. The behavior is the same as before replacing the t-stat.

 

[JoeCastor]

In doing some investigating, the troubleshooting guide indicated to check the signal wire as it could have come loose. This is a daisy-chained wire that goes to an upper unit control board #1, then to #2, and so on. I can identify a signal wire (purple, pin 5) at the thermostat, but I haven't a clue where to find the upper unit control boards. Anyone have a clue where to look?

 

[JoeCastor]

Problem solved. They lied that the new T-stat didn't need to be reprogrammed. That solved the problem. Apparently when they put in all the new batteries (yes, all , it was disconnected long enough that all memory was lost. None the less, all is working - and at no expense.

 

[Sarah_W]

Problem solved. They lied that the new T-stat didn't need to be reprogrammed. That solved the problem. Apparently when they put in all the new batteries (yes, all , it was disconnected long enough that all memory was lost. None the less, all is working - and at no expense.

Glad you got it figured out, Joe. Thanks for reporting back on the fix; that might help someone else sometime.