Gen 3 aux connection issues

[majcap]

I have a single stage, single fuel heat pump with a single stage compressor and two separate aux heat strips (5 KW each).

The two aux strips are jumpered at the W/E and W2 terminals on the existing Pro 1 thermostat--visible in photo.  The literature for the air handler and the existing thermostat suggest doing this despite also having emergency heat.  This apparently provides a warmer outlet temperature rise.   I got an E83 error code when I connected white and black wires to W1 and W2 on the new Nest.  Is there a way to override this or should I attempt to jumper these two wires prior to insertion in the Nest?  I was so frustrated, that I sent the thermostat back, but now I want to order another and try again.  Also, I connected the existing Orange wire to OB, but the heat ran while the dial said the unit was in cool mode.  Thanks!

[Lance_L]

Hello majcap,

Thanks for visiting the Community.

I’m sorry to hear that you’re having trouble setting up the Nest thermostat. I’d be happy to help you with this. 

To figure out if your HVAC system is compatible with Nest thermostats, I need a few pieces of information: what country are you located in? What model of Nest thermostat do you plan to install? What is the make and model of your HVAC system?

Looking forward to your response,

Lance

[majcap]

US, Gen 3 learning; Rheem Heat Pump model H1-T air handler--single stage inside and outside, however inside unit has two 5KW heat strips  wired together at existing thermostat, all as described in initial post

[majcap]

Existing wiring with jumper across strips

[majcap]

Lance--did you get my reply to your query??  Here it is again:

US, Gen 3 learning; Rheem Heat Pump--single stage inside and outside, however heat strips are two stage wired together, all as described in initial post

[Lance_L]

Hey majcap,

Thanks for keeping me in the loop and for the follow-up information. I’m sorry for the delayed response here.

Your system may be compatible with the Nest Learning Thermostat 3rd gen. The E83 error displays because a heat pump can have at most one auxiliary heat wire. You're right in thinking that the black and white wires need to be spliced before connecting to the Nest thermostat. Before you begin, turn off the power to your system. Then connect the wires as follows:

• Yellow: Y1
• Green: G
• Orange: OB
• Red: RC
• Black and white: W2/Aux
• Blue: C

If the system starts to blow warm air when it's in Cool mode, change the O/B wire settings.

1. On your thermostat, go to Settings.
2. Select Equipment.
3. Select Continue > Continue.
4. Select Heat Pump.
5. The Nest thermostat defaults to an O setting for heat pumps.
   1. If the O option is highlighted, select B.
   2. If the B option is highlighted, select O.
6. To make sure the issue is resolved, test your heating and cooling again.

Here’s a handy guide to help you troubleshoot heat pump issues.

Let me know how it goes.

Regards,

Lance