Honeywell RTH8500WF Wi-Fi Serie Mode D'emploi page 48

Unregistering thermostat
If you remove the thermostat from your
Total Connect Comfort website account (for
example, you're moving and leaving the
thermostat behind), the message center
will scroll UNREGISTERED FROM TOTAL Inside
CONNECT for 3 minutes.
After that, it will alternate displaying
MORE
REGISTER AT TOTAL CONNECT, the MAC
ID and the MAC CRC.
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69-2715EF—01