Display shows Lo or L0 and the interior temperature reading appears extremely low or flashing.

Safety first: Unplug the refrigerator before accessing interior panels.

Check for ice buildup:

• Inspect the area around the temperature sensors for heavy ice or frost. If present, defrost the unit by unplugging it and leaving doors open until all ice melts.

Sensor testing:

• Locate the affected compartment thermistor (refrigerator or freezer).
• Disconnect and measure resistance with a multimeter. A very low resistance (near zero ohms) indicates a shorted sensor.

Repair: Replace any shorted thermistor with the correct Summit part. Ensure the sensor is properly positioned away from direct contact with evaporator plates. If a new sensor does not resolve the Lo reading, the main control board may be defective.