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 WiFi 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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