Ice maker stops mid-cycle and displays E04; ice plate or evaporator heavily frosted

Safety First: Disconnect power before accessing internal panels or sensors.

How to check:

• Visual inspection: Remove the front or side service panel to access the evaporator plate area. Locate the small thermistor clipped to the evaporator or ice plate on your Arktic unit.
• Check mounting: Ensure the thermistor is firmly clipped and making good contact with the metal surface. A loose sensor can cause incorrect temperature readings.
• Inspect wiring: Follow the thermistor wires back to the harness and control board. Look for pinched, cut, or corroded connectors. Reseat all plugs.
• Test thermistor resistance: With the unit unplugged, disconnect the thermistor and measure its resistance at room temperature. Compare to the Arktic service chart (commonly 5–10 kΩ at 25°C). If readings are far off spec or open/shorted, replace the evaporator thermistor.
• Clear frost: If the evaporator is heavily iced, allow the unit to fully defrost (doors open, power off) for several hours before restarting.

Note: If E04 returns after sensor replacement, the main control PCB may be misreading the sensor and require replacement.