Whirlpool ice maker shows E4 and does not complete freeze cycle

Safety: Unplug the unit before removing panels or touching wiring.

• Access evaporator area: Remove the ice bin and inner panels to expose the evaporator plate or grid.
• Locate overtemp/defrost sensor: This sensor is often clipped to the evaporator or nearby tubing. Verify it is firmly attached and not hanging loose.
• Inspect for ice buildup: Heavy ice accumulation around the sensor can cause false readings. Allow the unit to fully defrost (doors open, power off) for several hours, then restart.
• Test sensor resistance: Disconnect the sensor and measure resistance. Compare to the service chart. Replace if readings are out of range.
• Check harness and board: Inspect wiring to the control board for damage. If sensor and wiring are good but E4 remains, the control board’s sensor circuit may be faulty.