⚠
warning Honeywell
Error Code unlock
Keypad lockout is active — the display shows 'unlock' when the keypad is locked and temperature settings cannot be changed.
? What Causes This
Keypad lockout has been enabled (set to PART or ON) to restrict thermostat access.
✓ How to Fix It
- Press the CENTER button and enter the default password
- Press up or down arrows to change each digit.
- Press Select after each digit.
- Once all four digits are entered, press Select again to unlock.
- To disable lockout, press Menu > down arrow to LOCK > Select > OFF > Select.
Source: page 5 of the official manual
From the manual
This error code appears in:
Honeywell T4 Pro Thermostat