topic Re: Nest with Rheem in Nest Thermostats

Nest with Rheem

Enggrl — Thu, 15 Sep 2022 18:17:06 GMT

I have a rheem heat pump system. Since about 2018 I had a nest learning thermostat. This summer I had a capacitor go out on my AC. The AC company came out to fix it, but when they got the system back up and running the system was on heat not cool. They explained about the rheems having opposite reversing valves from most systems. Long story short they couldn’t get the nest thermostat to work again. They went ahead and put the original thermostat back on so I had AC.

Any ideas on why it quit working or how to get it working again? I am attaching a picture of the current wiring old thermostat so so you can see what wires. The apparently unlabeled is a blue wiring going to o/b.

Re: Nest with Rheem

CoolingWizard — Thu, 15 Sep 2022 20:35:13 GMT

On the nest system app, when you were installing the originally, a decision had to be made whether or not the system by default as in heating mode or cooling mode. Some systems are cooling and some systems by default are heating. To switch modes you must energize the reversing valve. After they repaired your system, it seems strange that it was not working unless they change the reversing valve. In the nest setup menus, it is possible to switch the mode of the O wire from either energize with cooling or energize with heating.

I also noticed that the wires in your thermostat have much of the installation damaged and conductors might be shorting with each other. And sometimes HVAC companies that do not work with Nest installations take this action to charge you for a new thermostat. Hopefully all they did was put your old one back on.

You should be able to reinstall your nest thermostat, once it’s installed, go back to set up off the main screen, turn the dial to system, and you’ll see the set up for system type heat pump, and under there you’ll see a setting for the O. You will either choose energize for cool or energize for heat. That’s how you change the mode of how the thermostat treat your heat pump.

Ken The AC Cooling Wizard

Re: Nest with Rheem

Jeran — Mon, 19 Sep 2022 21:11:54 GMT

Hey there Engr,

I'm just checking up on this thread, did you have any more questions or need any additional help?

Thank you for helping out on this thread, CoolingWizard!

Best regards,
Jeran

Re: Nest with Rheem

Jeran — Fri, 23 Sep 2022 16:28:11 GMT

Hey there Enggrl,

Did you have any more questions or need any additional help?

Thank you,
Jeran

Re: Nest with Rheem

Jake — Mon, 26 Sep 2022 19:46:11 GMT

Hey there,

I wanted to check in with you, and let you know that I will be locking the thread in 24 hours.

Best regards,

Jake