How do I unregister my thermostat from a previous account?

For Total Connect Comfort Users: If you have access to the previous account, delete the thermostat by logging into the Honeywell My Total Connect Comfort account here and selecting MY LOCATIONS listed towards the top of the screen.

• Select the cogwheel labeled SETTINGS and scroll down to locate the Mac ID and CRC number for the thermostat.
  
  
• Select the TRASHCAN listed next to the Mac ID and Mac CRC numbers.
  
  If you are unable to access the previous account, please contact Resideo Customer Care.

Resideo App users.

if you have access to the account the thermostat was registered to, login to the app and then:

Select the thermostat,

Select the settings cog wheel icon in the top right corner.

Select THERMOSAT CONFIGURATION, then select

DELETE THERMOSTAT.