21 69-2715EF—07
Troubleshooting
Lost Signal
If the noWiFi indicator displays in place of the
WiFi strength indicator in the upper right hand
corner of the home screen:
• Check another device to be sure WiFi 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 WiFi network.
M33997
33997
Error Code Action
E01
During WiFi 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 WiFi password. This
code displays for 30 seconds,
then the thermostat will re-
enter WiFi Setup mode.
• Re-enter password for your home WiFi network.
• Repeat setup process and confirm your password for your
home WiFi 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
E42
Router is not issuing
an IP address 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 (see page
10).
• Verify your router is correctly setup
to automatically give IP addresses.
E43
No internet
connection.
Thermostat 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 (see
page 10).
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