What does error code E02 mean and how do I fix it?
Error code E02 means an invalid Wi-Fi password was entered. The code displays for 30 seconds, then the thermostat will re-enter Wi-Fi Setup mode. To fix it, re-enter the correct password for your home Wi-Fi network and repeat the setup process. (Page 59)
From the official Honeywell RTH6580WF Wi-Fi Smart Thermostat manual, page 59
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