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Troubleshooting
Lost Signal
If the no-WiFi 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.
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
E01
During WiFi Setup, the router
lost power.
E02
Invalid WiFi password. This
code displays for 30 seconds,
then the thermostat will re-
enter WiFi Setup mode.
Error Code
E42
Router is not issuing
an IP address to the
thermostat.
E43
No internet
connection.
Thermostat cannot
communicate to Total
Connect Comfort.
E99
General error
Action
• Ensure your router has power.
• If trying to connect to a hidden or manually added network,
confirm the router has power and is working.
• Re-enter password for your home WiFi network.
• Repeat setup process and confirm your password for your
home WiFi network.
Action
• 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.
• Make sure the Internet cable is
plugged in.
• Reboot the router.
Remove thermostat from wallplate
for 10 seconds, then reconnect it (see
page 10).
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M33997
M33997
M33999A
M33998A
69-2715EF—07
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