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info Honeywell
Status Register at Total Connect
The thermostat has not been registered to a Total Connect Comfort account or registration has been removed.
? What Causes This
Thermostat is not registered to an online account, or was unregistered from an account (e.g., when moving).
ⓘ What This Means
Register the thermostat online at mytotalconnectcomfort.com using the MAC ID and MAC CRC codes.
Source: page 42 of the official manual
From the manual
This error code appears in:
Honeywell RTH6580WF Wi-Fi Smart Thermostat