Freezer displays E18, which may indicate a sensor short circuit.

Safety first: Unplug the freezer before testing any sensors.

• Identify the specific sensor: Refer to the technical sheet to determine which sensor E18 refers to (evaporator, cabinet, or ambient).
• Inspect the sensor and harness: Look for crushed or rubbed-through insulation that may be causing wires to touch. Repair with heat-shrink tubing or replace the harness.
• Test the thermistor: Disconnect it and measure its resistance. A reading near 0 Ω indicates a shorted sensor; replace it.
• Dry any moisture: If condensation is present at the connector, dry it thoroughly and apply dielectric grease to prevent recurrence.
• Replace the control board: If the sensor and wiring are good but E18 persists, the board input may be internally shorted and require replacement.