cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 
Help
Replies are disabled for this topic. Start a new one or visit our Help Center.

Nest Gen 4 duel fuel wiring question.

zacthomas94
Community Member

‎02-13-2025 03:24 PM

I was seeking confirmation if my wiring diagram would be correct for a gen 4 thermostat on my duel fuel unit. My unit consists of a primary heat pump then the break point is set to *36 degrees and kicks on propane furnace. I have noticed sometimes when the outside temp reads around *42 my propane will kick on for an instance then switch back to the heat pump kicking on, My old Honeywell thermostat never did this. my wire configuration consists of the following:  Y1 (HEAT/COOL) / W1 (ALT HEAT )/  G (FAN) /   C (24V) /  OB (HEAT PUMP) /   RC (POWER)

 

Labels:
0 Kudos
Reply
1 REPLY 1

sicsacol
Community Specialist
Community Specialist

‎02-16-2025 11:07 AM - edited ‎02-16-2025 11:44 AM

Hi @zacthomas94,

 

Thanks for posting. I'm sorry to hear you're going through this with your Nest thermostat 4th gen and your system. Don't worry, let's work together to fix this.

Based on the information shared, your wiring information appears correct and compatible with the Nest thermostat 4th gen and your heat pump system. However, since you're experiencing this issue, I have some questions for you:

  • When did the issue start?
  • What other strange symptoms have you experienced since the problem started?
  • Are there any error messages? If so, what are they exactly?
  • When was the last maintenance check for your HVAC system?
  • Does the issue happen on heating only, cooling only, or both?

Please let me know the answers to these questions, and I'll be happy to help you further.

 

Cheers,
Jonathan

 

0 Kudos
Reply