Freezer temperature is too high and the display shows E1; freezer may not reach -18°C even with continuous running.

Safety first: Disconnect the refrigerator from power before accessing the freezer panels or control board.

Diagnostic and repair steps:

• 1. Confirm ventilation and load: Ensure the freezer is not overpacked and that air vents are not blocked. If E1 persists, proceed.
• 2. Access the freezer NTC: The freezer sensor is typically behind the rear interior panel or clipped to the evaporator tubing. Remove drawers and the rear panel (usually held by screws and clips). Do not force the panel if it is frozen in place; defrost with a hair dryer on low, keeping it away from plastic parts.
• 3. Visual inspection: Look for ice buildup around the sensor, damaged insulation, or corroded connectors. Gently disconnect and reconnect the sensor plug.
• 4. Measure sensor resistance: With the unit unplugged, disconnect the NTC and measure resistance. At around 0°C, many NTCs read ~12–15 kΩ; at -18°C, ~30–50 kΩ (values vary by model). If the sensor is open, shorted, or clearly out of range, replace it.
• 5. Check wiring continuity: Trace the harness from the sensor to the main PCB. Use a multimeter to verify continuity on each conductor. Repair any breaks or burnt sections and secure the harness away from sharp metal edges.
• 6. Replace the freezer NTC: Unclip the old sensor from the evaporator or bracket, install the new one in the same position, and route the cable along the original path. Ensure it is not in direct contact with heater elements.
• 7. If E1 remains after replacement: The main control board may not be reading the sensor correctly. Replacement of the PCB is indicated; due to programming and safety, this is typically a technician-level repair.