E4 displayed, ice maker stops mid-cycle, evaporator plate may be heavily frosted or not forming ice properly.

Safety First: Disconnect power before removing panels or handling wiring.

• Access evaporator area: Remove the front panel and any internal covers to expose the evaporator plate and attached thermistor (usually clipped or bonded to the plate or suction line).
• Inspect thermistor: Check that the thermistor is firmly attached to the evaporator surface and not hanging loose or damaged.
• Check wiring: Follow the thermistor wires back to the control board. Look for cuts, pinches, or loose connectors. Reseat the connector at the board.
• Test resistance: With power off, disconnect the thermistor and measure its resistance with a multimeter. Compare to the temperature/resistance chart in the Amana tech sheet (commonly 5–50 kΩ depending on temperature). An open or 0 Ω reading indicates a bad thermistor.
• Replace thermistor: If readings are out of spec, replace the evaporator thermistor with the OEM part. Secure it in the same location and ensure good thermal contact.
• Reset unit: Restore power and clear the error by unplugging for 5 minutes or using the diagnostic reset procedure.