E4 displayed; ice maker stops, compressor may run briefly then shut off, possible frost buildup

Safety: Unplug the unit before defrosting or accessing internal components.

• Check for frost/ice buildup: Remove the front or top cover to view the evaporator. If it is heavily iced over, the sensor may be reading incorrectly.
• Manual defrost: Leave the unit unplugged with the door or lid open for several hours until all ice melts. Place towels to catch water. Do not chip ice with sharp tools.
• Clean condenser and fan: Dust-clogged condenser coils or a weak fan can cause low temperatures and frost. Vacuum the condenser and ensure the fan spins freely.
• Inspect evaporator sensor: Confirm the sensor is firmly attached to the evaporator surface and not dangling. Clean any corrosion and reseat its connector on the PCB.
• Restart and test: After defrosting and cleaning, restore power and run a cycle. If E4 reappears quickly, the sensor or control board may be faulty.
• Replace parts as needed: Replace the evaporator thermistor first. If the error persists with a new sensor, consult a technician to test and replace the main control board.