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Nest learning thermostat configuration for Trane Heat pump heating in COOL mode

Edkuscg
Community Member

‎01-12-2024 01:56 PM

Good Afternoon everyone!!! Well Thank you for the help in the other thread but the problem is still not resolved. The issue is I have followed the wiring suggested and provided information for voltages and such but I still can not use COOL mode for cool. When I operate in HEAT, all works great. When I switch to COOL mode the compressor comes on and then shuts down after about 15-20 seconds, i also have heat coming out of the registers.

The previous thread Nest 3rd Gen to Trane Heat Pump TWE040E13FB2 with XR 12 condenser gave me the wiring specs.

Original Thermostat Wiring:

  • R (jumped to Rc) - Red
  • O - Orange
  • Y - Yellow
  • G - Green
  • B - Blue
  • X2 - Black
  • W1 - White

 

Suggested Nest Learning Thermostat Wiring:

  • Rc or Rh - Red (either one should work, depending on your specific HVAC system)
  • O/B - Orange (set it to O in the thermostat settings)
  • Y1 - Yellow
  • G - Green
  • W2/AUX - White
  • C - Blue
  • * - Black

Fan works fine, variable speed. 

Heat works fine.

Cool not operating and I’m wondering if the pro setup could help assign the terminals. 

Thank you for your input and looking forward to getting this thermostat working.

 

Thanks!!

 

Eric

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zoeuvre
Community Specialist
Community Specialist

‎01-19-2024 09:24 AM

Hi Edkuscg,

 

I apologize for the continued issue you're facing with your Nest Thermostat when operating in Cool mode. If you've followed the suggested wiring and still experiencing problems, double-check all the wiring connections at both the thermostat and the HVAC system. Make sure each wire is securely connected to its respective terminal and that there are no loose or damaged connections. Ensure that the wires are correctly identified and connected to the corresponding terminals on the Nest Thermostat. Also, in the Nest thermostat settings menu, verify that the O/B wire is set to "O" to activate the cooling mode. You can access this setting through the thermostat's display. Go to Settings > Equipment > Continue > Continue > Heat Pump. 

 

Let us know how it goes.

 

Best,

Zoe

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