Nest wiring heat activates AC fan

[NissanNismoZ]

Hello, so my nest is working great so far except one issue.

I have separate heat/air units. Electric furnace for heat. Outside package unit for air.con.

Red(RH) and white (W1) for heat.

Red(Rc) G(green) and Yellow(Y1) for A/C

When I set it to heat, it heats, but also activates the A/C systems fan.

Is there a better way to set this up, so this doesn't happen? Since it thinks the heat and air units are one unit?

Thanks!

[EdwardT]

Hi NissanNismoZ,

Thanks for reaching out. I'd love to know more about this and I have a few questions:

• What type of Nest Thermostat do you have?
• When did the issue start?

Looking forward to your response.

Thanks,

Edward

[EdwardT]

Hi NissanNismoZ,

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do. 

Thanks,

Edward

[NissanNismoZ]

Hello, I Apologize for the late reply! I should mention it is the Google Nest Learning Thermostat. It is a new install. 

My current workaround is to set Heat type as 'In Floor Radiant'. This allows the furnace to kick on and use its own fan, rather than it working how it should + activating the A/C unit's fan as well. 

[EdwardT]

Hi NissanNismoZ,

Thanks for the response. To isolate the issue, please make sure that you've selected the correct heat type. Please follow the steps below:

1. Press the thermostat ring to bring up the Quick View menu.
2. Select Settings Equipment. You’ll see all the wires currently connected to your thermostat.
3. Continue. You’ll see a list of equipment attached to your thermostat.
4. Choose Heat type, then select the type of heating you have.

Let us know how it goes.

Thanks,

Edward

[EdwardT]

Hi NissanNismoZ,

I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.

Thanks,

Edward

[EdwardT]

Hi NissanNismoZ,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

Thanks,

Edward

[NissanNismoZ]

As mentioned, I have my heat type set as in floor radiant because nest isn't realizing the two units are separate. The furnace has it's own fan system that turns on when the thermostat calls for heat through it's two wires, RH, W1. When I have the heat set to in floor radiant, nest only calls for heat using those two wires. When I have it set to forced air, nest calls for heat using the two heat wires, plus the AC units green fan wire.

[EdwardT]

Hi NissanNismoZ,

Thanks for the response. We'd like to know more about this. Please fill out this form so we could investigate further.

Thanks,

Edward

[janthadeus]

Hey there,

We haven't received your form. Were you able to fill it out? Do you still need help?

I appreciate the help here, Edward.

Regards,

JT

[janthadeus]

Hi there,

I'm checking back in to see if you are able to fill out the form. If not, please do so, so we can assist you further with your concern.

Best,

JT

[EmersonB]

Hello everyone,

@NissanNismoZ just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.

I appreciate your help, Edward and JT.

Best,
Emerson