GE Refrigerator Error Code F603

The F603 error code on a GE refrigerator indicates that the fresh food door icemaker has entered a fault mode specifically triggered by a Harvest Fault condition. The harvest cycle is the process by which the icemaker warms its evaporator tray to release formed ice cubes into the storage bin. When this cycle fails to complete properly or does not complete within the expected time window, the control system logs a Harvest Fault. If this fault condition is detected, the icemaker transitions into a broader fault mode and generates the F603 code.

The components most likely involved in a Harvest Fault include the icemaker's heating element, the harvest thermostat or thermistor, the motor that rotates the ejector blades, and any associated wiring harnesses. A sensor that fails to confirm the tray has reached the proper release temperature, a motor that stalls during ejection, or an ice bridge that prevents cube release can all prevent the harvest cycle from completing. The control board monitors timing and sensor feedback throughout the cycle and flags the fault when conditions fall outside acceptable parameters.

Diagnosing F603 begins with a physical inspection of the icemaker's mechanical components, including the ejector arm, motor drive assembly, and ice tray for obstructions or ice buildup. Sensors and thermistors should be tested for proper resistance values to confirm they are reading accurately. Wiring connections between the icemaker module and the main control board should also be inspected for corrosion, looseness, or damage, as an intermittent electrical connection can mimic a component failure and trigger repeated harvest faults.