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error Honeywell
Error Code Connection Failure
The thermostat failed to connect to the Wi-Fi network during setup.
? What Causes This
Incorrect Wi-Fi password, router not responding, or network configuration issue.
✓ How to Fix It
- Confirm you correctly entered your home network password.
- Verify the router has power and internet access.
- Refer to FAQ at wifithermostat.com/support.
Source: page 30 of the official manual
From the manual
This error code appears in:
Honeywell RTH6580WF Wi-Fi Smart Thermostat