05-10-2022 02:13 PM
My Nest Tstat won't turn on my AC, it blows hot air instead. I paid a HVAC tech for a service call and he tells me that the tstat is bad (wasn't sending the signal to the cooling unit). He wired the condenser to work temporarily but says to replace the tstat, otherwise I won't be able to use the heat during the cold season. How do I get a replacement?
Answered! Go to the Recommended Answer.
07-01-2022 03:18 PM
Hey Gunfish1,
Awesome! Feel free to submit another post, and provide as many details as possible so that others can lend a hand.
Thanks,
Archie
05-10-2022 09:10 PM
Did it work in the past or is this a recent installation of the Nest thermostat?
If recent, post a picture of the original thermostat's wiring here
05-11-2022 05:59 AM
It worked fine for the first 4 months, both heating and cooling
05-11-2022 07:04 AM
05-11-2022 07:54 PM
Sounds like this is the first time that you are using the A/C site since you installed it.
Have you tried changing the reversing valve control? You can give it a try as it won't hurt anything.
If your system starts to blow cool air when your Nest thermostat is in Heat mode (or if it blows warm air when it's in Cool mode), change the settings for orientation of your heat pump.
05-13-2022 07:17 AM
I followed your instructions and had the same result. Hot air still comes out of the vents on the cool setting. Anything else I should try?
05-12-2022 06:08 AM
I did test the AC mode when I first installed it and it worked fine, ,although I didn't run it very long. I'll check out the settings when I get home today. Thanks very much for the detailed instructions! 👍
05-13-2022 07:24 AM
It was set to O, so I set it to B. When that didn't work, I set it back to O again.
05-17-2022 08:45 AM
I'm still having the same problem. Is there anyone who can help me?
05-18-2022 02:47 PM
I am having the same issue, the problem is with the Nest itself. There is an (apparently prevalent) issue that causes the O/B wire to not become energized such that the heat pump reversing valve will not activate. Saw online a tech guessing there’s a bad FET controlling the O/B wire signal. Confirmed at my unit, with the unit set to both heating and cooling mode, and with the orientation both set to O and B. Never voltage on the O/B wire. Jumping the O/B and R together at the compressor turned on the cooling right away. Replaced the Nest with a Honeywell stat and all worked as it should. You (and I) have a faulty product.
05-18-2022 03:45 PM
Thanks, Bobby. Any luck on getting a replacement or is this money down the Google drain?
05-18-2022 04:49 PM
Hoping to get something. Mines only 5 months old and the cooling didn’t work on the first day I tried to switch over. Started a warranty claim, they were saying I’d have to pay for a new unit and send back my old one, then they’d reimburse. Phone call got cut off before I was finished talking but that doesn’t sound the best to me…
05-18-2022 07:24 PM
Lovely. Guess I'll try to call anyway. Thanks for the input!
05-18-2022 07:32 PM
Anyone know how I proceed with a warranty claim?
05-18-2022 07:41 PM
Start at support.google.com. I eventually got to an option for them to call me.
06-05-2022 10:51 AM
Hey, Bobby. I made my way to the chat option. Long story short, they sent me a replacement tstat and it works!
06-29-2022 11:22 PM
Hey folks,
As we got our resolution here, I'm going to mark this one as resolved. Please feel free to open up a new thread if you need assistance.
Thanks,
Archie
06-30-2022 07:59 AM
👌
07-01-2022 03:18 PM
Hey Gunfish1,
Awesome! Feel free to submit another post, and provide as many details as possible so that others can lend a hand.
Thanks,
Archie
05-18-2022 07:54 PM
Thanks again, Bobby