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Nest firing air conditioner in heat mode

nimishsn
Community Member

Just installed the Nest thermostat. On testing heater mode, it is starts the air conditioner.

On cool mode as well, it starts the air conditioner, which is fine. 

 

Please help.

 

1 ACCEPTED SOLUTION

Patrick_Caezza
Platinum Product Expert
Platinum Product Expert

You have it wired the way I would wire it.

Try doing a factory reset on the thermostat and set it up again from scratch making sure to select only the W/W1, Y/Y1, G/G1, and R wires.

Nest thermostats are designed to work without a common ("C") wire in most homes. During installation, a small number of customers may find that the Nest Thermostat does not receive sufficient power. The Nest Power Connector or a C wire may be necessary. See g.co/nest/cwire for details.

View solution in original post

10 REPLIES 10

nimishsn
Community Member

@members 

Patrick_Caezza
Platinum Product Expert
Platinum Product Expert

Post a picture of the original thermostat's wiring here

nimishsn
Community Member

Original

 

20220424_182844_remastered.jpg

 Nest

20220424_195715.jpg

Patrick_Caezza
Platinum Product Expert
Platinum Product Expert

You have it wired the way I would wire it.

Try doing a factory reset on the thermostat and set it up again from scratch making sure to select only the W/W1, Y/Y1, G/G1, and R wires.

Nest thermostats are designed to work without a common ("C") wire in most homes. During installation, a small number of customers may find that the Nest Thermostat does not receive sufficient power. The Nest Power Connector or a C wire may be necessary. See g.co/nest/cwire for details.

I just had the same issue, but I also have a blue wire which is in the "

B" connection in my original thermostat. We tried it as the C wire and as the B wire with a factory reset each time we tried again. Never worked, so we put the old thermostat back to have a bit of heat for the night as we could only get it to blow cold air. Any additional suggestions? Maybe it isn't compatible? Here is the original wiring.

20220425_170640.jpg

Patrick_Caezza
Platinum Product Expert
Platinum Product Expert

Start your own thread and don't hijack someone else's as it will get missed. You are lucky I saw this.

I'm so sorry. I didn't realize asking a follow up question would be considered "hijacking" another question. I was just trying to figure out if I could et an answer to a similar question. 

MelbaDT
Community Specialist
Community Specialist

Hey folks, 

 

Thanks again for your answer, Patrick_Caezza. 

 

nimishsn, glad to hear that you've managed to have  it working as it should with the help of Patrick's suggestions. Feel free to reach out again should you have more questions. 

 

CDalton, no worries — no harm done. Also, we've replied to your own thread. Let's continue there. 

 

Best, 

Melba

MelbaDT
Community Specialist
Community Specialist

Hi, 

 

I haven't heard from you in a while so I'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.

 

Best, 

Melba

nimishsn
Community Member

Factory reset and selecting the wire configs you mentioned worked, probably I selected an incorrect wire setting.

Thanks a lot for your help!