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Google Nest Learning Thermostat wiring with Goodman heat pump

jlb4350
Community Member

‎02-21-2024 05:54 AM - edited ‎02-22-2024 05:31 AM

Hello all. I have a Goodman model GPH1330H21AD electric single stage heat pump with aux/emergency heat. I had a plain Honeywell thermostat and bought a Google nest learning thermostat. The fellow from our coop came and installed it, but I don’t think it’s installed correctly because the heat strips that used to come on during cold days no longer activate. Unfortunately, I didn’t take a pic of the previous wiring.  The reason I think it’s not right is that the Nest documentation says that if there are wires in W1 AND W2/Aux, that denotes a dual fuel unit, but my system is all electric, not dual fuel. Also, my understanding is that there is supposed to be a heat pump balance option in my Nest menu but that option does not appear, further indicating that my wiring is incorrect.



I’m including a link to a pic of my current Nest wiring. Does anyone have any insight about how to correctly wire the system? I called the coop and they insist that they did it right, but the aux/emergency heat never kicks on and the house never heats up past 68 degrees on cold days (set to 71). 

https://ibb.co/f0hpFD4 

 

Thank you for any help you can provide. 

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Markjosephp
Community Specialist
Community Specialist

‎02-24-2024 07:49 AM

Hello jlb4350,

It sounds like you're dealing with some Nest Thermostat wiring issues for your Goodman heat pump with aux/emergency heat. Understanding the correct wiring is crucial to ensuring your system functions properly. Here are a few suggestions to help you troubleshoot and potentially resolve the issue:

 

  • Ensure that your thermostat is compatible with electric single-stage heat pumps with aux/emergency heat.
  • Based on your current wiring (Y1, G, Rc, W1, W2, C, OB), it seems you have the essential wires connected. However, discrepancies could still exist. Confirm that each wire is properly inserted into the corresponding terminal on your HVAC system control board. You can share with us a photo so we can see how they are being labeled.
  • Check that the settings on your heat pump are aligned with the thermostat. Sometimes, a mismatch in settings between the thermostat and the heat pump can lead to heating issues.

 

Keep me posted on how it goes.

Best regards,
Mark

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