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69-2738EFS—03
M33998
Troubleshooting
Lost Signal
If the no-Wi-Fi indicator displays in place of the Wi-Fi strength indicator in the upper right
hand corner of the home screen:
• Check another device to be sure Wi-Fi is working in your home; if not, call your
Internet Service Provider.
• Move the router.
• Restart the thermostat: remove it from the wallplate, wait 10 seconds, and snap it
back onto the wallplate. Return to Step 1 of Connecting to your Wi-Fi network.
Error Codes
For certain problems, the thermostat screen will display
a code that identifies the trouble. Initially, error codes are
displayed alone in the time area of the screen; after a
few minutes, the home screen is displayed and the code
alternates with the time.
Error Code
Action
E01
During Wi-Fi Setup, the router
lost power.
• Ensure your router has power.
• If trying to connect to a hidden or manually added network,
confirm the router has power and is working.
E02
Invalid Wi-Fi password. This
code displays for 30 seconds,
then the thermostat will re-enter
Wi-Fi Setup
mode.
• Re-enter password for your home Wi-Fi network.
• Repeat setup process and confirm your password for your home
Wi-Fi network.
E42
Router is not issuing an IP ad-
dress to the thermostat.
• Wait for 30 minutes,
connection can take several
minutes.
• If still no connection, remove
thermostat from wallplate for
10 seconds, then reconnect it.
• Verify your router is correctly
setup to automatically give IP
addresses.
E43
No internet connection. Thermo-
stat cannot communicate to Total
Connect Comfort.
• Make sure the Internet cable is plugged in.
• Reboot the router.
E99
General error
Remove thermostat from wallplate for 10 seconds, then reconnect
it.
M33999
