Display shows Lo and the set temperature cannot be adjusted lower, or the unit appears to be in a low-temperature lockout.

Safety first: No internal high-voltage work is required for basic checks, but unplug the unit if removing panels.

Steps to address Lo:

• 1. Check user settings: Consult the STAIGIS user manual to confirm the minimum allowable set temperature. Lo may simply indicate you have reached the lowest setpoint.
• 2. Attempt unlock/reset: Some models require holding specific buttons (e.g., UP and DOWN together for 3–5 seconds) to unlock or reset the control. Try the documented key combinations.
• 3. Verify actual temperature: Use a thermometer to ensure the interior is not excessively cold. If the unit is overcooling, suspect a sensor or control issue.
• 4. Inspect and test sensor: If overcooling, test the cabinet NTC sensor for proper resistance. Replace if out of specification.

Note: If Lo persists and the unit does not respond to button presses, the control panel board may be faulty and require replacement.