Honeywell RTH6580WF1001/U User Guide

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21 69-2715EF—07

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.

M33997

33997

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.

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.

M33999

M33998

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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Honeywell RTH6580WF1001/U Home Wi-Fi 7-Day Programmable Thermostat

User Guide - Page 23