‎11-05-2023 04:08 PM
Trying to help set up my grandma's Nest in AZ and running into trouble. Old thermostat has O,B,W,G,RH wires. I tried connecting B to the C and the O to the O/B as others had success with. I received an error from Nest looking for the Y and moved the W to the Y. When we turned it on, instead of AC it was blowing heat. Help!!
‎11-05-2023 05:24 PM
Nest tech help had me rewire back the W to original place. But then received the error code E77 looking for a Y1 wire. I contacted support again and they stated I need to have a dedicated Y wire added. It's there an easy fix to this without calling a specialist?
‎11-06-2023 01:43 AM
Do you have a picture? Also do you have a yellow wire.
‎11-06-2023 08:04 AM
I do have a yellow wire and a picture: https://photos.app.goo.gl/VoFm8sjPH8QFnEhL9
It is a heat pump system. I've also tried moving the yellow wire to Y but when turning on the AC all we had was the fan and no cooling.
‎11-06-2023 09:10 AM
Here is my wiring.https://photos.app.goo.gl/JiainJqUwfccshto7
‎11-09-2023 06:58 AM
Hi folks,
Thanks for chiming in, @CO_AZ.
@Subiewrx22, oh no! Let's see what's going on.
Are you located in North America or Europe? What type of Nest Thermostat do you have? Since you have a heat pump heating system, your thermostat wires should be wired as follows:
Let us know how it goes.
Best,
Zoe