Just installed a 3rd Gen Learning thermostat and I cannot get the A/C setting to blow cold air

[NestedBear]

I have a six wire thermostat I am attempting to replace with a 3rd Gen Nest learning thermostat. On the old thermostat, the wires are connected as follows:

• Blue Wire - C
• Red Wire - R
• Orange Wire - W
• Yellow Wire - Y
• Green Wire - G
• White Wire - W2

When I connect the NEST thermostat I follow the instructions and set as follows:

• Blue Wire - C
• Red Wire - Rh
• Orange Wire - W1
• Yellow Wire - Y1
• Green Wire - G
• White Wire - W2

The heat works great on both heat 1 and heat 2 settings. The A/C never gets cold. It blows and acts like it is working, but it just never blows cold. 

After getting frustrated, I disconnected the Nest thermostat and reconnected the Honeywell thermostat as described above, and the A/C is working fine.

Any help?

[Wuzwas67]

I have the same exact problem 

[luciaaa]

Hi, @NestedBear and @Wuzwas67,

Thank you for reaching out to the community. I'm sorry to hear that your AC isn't blowing cool air. I'm happy to help you find a solution.

Thank you for the details you've provided. Based on that information, it seems your system is compatible with our Nest thermostats.

To effectively troubleshoot, please provide the following:

• Photos of your previous and current wiring configurations.
• When did you install the Nest thermostat?
• Do you have a heat pump system or a conventional system? Some thermostats have separate labels for these systems.

To clarify:

• Conventional System: Typically consists of two pieces of equipment (furnace and AC).
• Heat Pump: Handles both heating and cooling with a single unit.

Keep me posted.

Best regards,

Ana

[Wuzwas67]

I some how figured it out it’s all working great thank u 

[luciaaa]

Hi, @Wuzwas67,

Thank you so much for the update. I’m glad to hear that the inconvenience has been resolved.

Please don’t hesitate to contact us in the future. 

Best regards, 

Ana

[NestedBear]

Can you tell me what you did? Mine is still not working. Please?

[Wuzwas67]

• I actually had 2 jumpers on my Honeywell after a long google search i finally figured it out it’s working perfectly now here’s my wire configuration it won’t let me put a picture in here  of my wiring ok I’ll try this 
• y1 yellow 
• G green 
• OB orange
• w2 white 
• * Blue
• RH red  
• i hope this helps you 

[NestedBear]

I believe it is a fuel pump system. This is how it was previously setup:

This is how I wired the Nest Thermostat:

Please help!

[luciaaa]

Hi, @NestedBear,
 

Thank you so much for your response and for all the details provided. Based on the pictures, it seems you have a heat pump system.

Here's how to connect the wires to your Nest Learning thermostat (3rd generation):

• Before continuing, turn off the breakers.
• Red wire goes to RH.
• Orange wire goes to O/B 
• Yellow wire goes to Y1. 
• Green wire goes to G. 
• White wire goes to W1. 
• Blue wire goes to C.
• Turn on the breakers.
• Perform a factory reset on the thermostat and set up the thermostat.

Let me know how it goes.

Keep me posted, 

Ana