Proline freezer displays E3 and may not respond correctly to temperature setting changes.

Safety first: Unplug the appliance before removing the control panel or display housing.

Steps to resolve E3:

• 1. Access the control fascia: On many Proline freezers, the ambient sensor is located behind the top-front control panel or in the display housing. Remove screws or unclip the fascia carefully.
• 2. Identify the ambient sensor: Look for a small probe or thermistor connected by two thin wires to the display or main PCB.
• 3. Inspect connections: Check for loose plugs, corrosion, or broken wires. Reseat the connector firmly.
• 4. Test the sensor: Disconnect the sensor and measure its resistance at room temperature. Compare to typical NTC values. If the reading is open, shorted, or clearly abnormal, the sensor is defective.
• 5. Replace if necessary: Install a new Proline-compatible ambient NTC sensor, matching the original type and connector. Secure it in the same location so it can accurately sense room temperature.
• 6. Reassemble and test: Refit the fascia, restore power, and verify that the E3 code clears and that the freezer responds to temperature adjustments.

Note: If the sensor tests correctly but E3 persists, the display PCB or main control PCB may require replacement by a technician.