Freezer beeps and displays E1; temperature may be warmer than setpoint

Safety first: Unplug the freezer before removing panels or handling wiring. Use insulated tools and avoid working on a wet floor.

• Power reset: Unplug the freezer for 5 minutes, then plug back in to see if the E1 code clears. If it returns, continue.
• Locate the evaporator thermistor: Remove the interior rear panel in the freezer compartment (usually behind the evaporator cover). The thermistor is a small sensor clipped to the evaporator tubing or wall with two wires leading to it.
• Inspect wiring and connector: Check for broken, pinched, or corroded wires between the thermistor and the control board (often in the control housing at the top or rear). Reseat the connector firmly.
• Test the thermistor: With the unit unplugged, disconnect the thermistor and measure resistance with a multimeter. At about 32°F (0°C), most Whirlpool thermistors read roughly 8–10 kΩ (check service sheet for exact spec). If reading is open (OL), 0 Ω, or far out of range, replace the thermistor.
• Replace the thermistor if faulty: Clip the old sensor out, install the new Whirlpool thermistor in the same location and orientation, and reconnect the harness.
• Check the control board: If the thermistor tests good and wiring is intact, the main control board may be misreading the sensor. Inspect for burnt spots or swollen components and replace the board if necessary.