Thermostat Wiring Compatibility

Honeywell Wi-Fi Programmable Thermostats

In order to power your Honeywell Wi-Fi smart thermostat, your system must contain a c-wire. Use the chart below to confirm that your system meets the compatibility requirements. This chart will determine compatibility with most systems, but as wiring systems vary from home to home, there may be some exceptions. To view videos on this topic, please click here.

1. Does your current thermostat have 110V or higher written on it?


YES:

Not compatible

NO:

Next Question


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2. Do you have thick wires that are connected using wire nuts?


YES:

Not compatible

NO:

Next Question



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3. Do you have a wire connected to terminal labeled "C"?

YES:

Congratulations, this thermostat will work with your system.

NO:

Next Question

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4. Do you have an extra wire that is not connected to any terminal on the thermostat wall plate?

YES:

Watch the video called:

"Substitute extra wire for C-wire"

NO:

Next Question

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5. Do you have a wire connected to terminal labeled "G"?

YES:

Watch the video called:

"Substitute G-Wire for C-wire"

NO:

Sorry, this Wi-Fi thermostat won't
work with your system. Click here for other thermostat options.

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Still need help? Let us answer your question.

To help you know for sure if your system will work with the Wi-Fi thermostat, please send us a picture of your current thermostat wiring.

  1. Take a picture of your current wall plate with  wires connected to the lettered terminals.
  2. Send via email to eccsupport@honeywell.com
  3. After sending the email, call us at 1-855-733-5465

Honeywell Customer Care Hours:
Monday – Friday from 8:00 AM – 7:00 PM CST/CDT
Saturday from 8:00 AM - 6:00 PM CST/CDT
Sunday from 9:00 AM – 6:00 PM CST/CDT