What should I do if my thermostat is already registered?

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For Honeywell Home thermostats, you will need to register the thermostat. Call 1-800-633-3991 to get it set up. When you call, make sure you have the following information ready:

  1. The MAC ID and CRC numbers for your thermostat.
  2. Make sure the thermostat is online and connected to your local Wi-Fi network.
  3. Check that you have created an account with the Resideo App.
  4. Make sure you are near the thermostat during the call. This process will take 20-30 minutes to complete.


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