Freezer not reaching set temperature, E02 displayed on control panel

Safety first: Disconnect power before accessing internal panels or wiring.

Diagnostic steps:

• Check for obvious airflow issues: Ensure freezer vents are not blocked by food. Excess frost buildup on the back panel may indicate a defrost problem rather than a sensor fault.
• Power reset: Unplug the unit for 5–10 minutes and plug back in. If E02 reappears, proceed with sensor checks.
• Access the freezer sensor: Remove shelves and the rear interior panel of the freezer (usually held by screws). The sensor is typically clipped to the evaporator or mounted on the rear wall in a small plastic housing.
• Inspect connections: Check the sensor plug and wiring for corrosion, loose fit, or damage. Reseat the connector firmly.
• Basic sensor test: If you have a multimeter, disconnect the sensor and measure resistance at room temperature. Bosch NTC sensors are typically in the 5–15 kΩ range at ~25°C (exact value varies by model). An open circuit or 0 Ω indicates a bad sensor.
• Replace if faulty: If resistance is out of range or intermittent when you gently wiggle the wires, replace the sensor with the correct Bosch part number.

Note: If a new sensor does not clear E02, the main control board may not be reading the sensor correctly and may require professional diagnosis and replacement.