Nest 4 th generation w1 w2 serup

[West31]

I replaced my gen 2 nest thermostat with a new gen 4. However my gen 2 had a w1 and w2 wire hooked up. This is for my heat pump and w2 controls stage 2 for heating. However my new gen 4 will not let me use both w1 and w2 wires. It says I must remove one. I didn’t hook the w2 wire however how will my stage 2 heat pump go on?

[EduardoN]

Hi @West31,

Thanks for contacting this community! I understand what you're experiencing. You've recently upgraded from a Nest Learning Thermostat (2nd gen) to a 4th-gen model. You're noting that while your previous thermostat used the W1 and W2 wires for two-stage heating, the new thermostat won't let you use the two-stage heating. No worries, I'm here to help you!

At this moment, let me share with you that the newest Nest Learning Thermostat (4th gen) is also capable of supporting a two-stage heating system, because we can use more complex systems. For reference, you can check out this article: Learn about multistage heating and cooling system.

For that situation with your new thermostat, I'd like to ask you some questions:

• Do you see an error code when you try to use the two-stage heating in the thermostat display or in the Google Home app?
• Could you send me a photo of the wiring in the new thermostat?
• In some cases, some systems are not compatible with certain Nest Learning Thermostats, depending on the generation. Because of this, what is the make and model of your HVAC system?

Please feel free to share any additional details you think might be relevant.

Best regards,
Eduardo

[West31 · Accepted solution]

Did you get my reply?

 Just when I try to attach the w2 for the nest 4 it says equipment error. E413

When I don't hook it up the system will run but how do I know it will turn the 2nd stage heat on when needed?

Model Amana. AMST36CU1300. AIR HANDLER

Model 15.2 SEER2HP 

[West31]

HI 

4th gen2nd gen