GE Ice Maker Error Code ON/OFF and QUICK ICE LEDs blinking

This blinking LED pattern indicates a harvest mode failure has been detected by the ice maker control board. Specifically, it means the evaporator thermistor circuit is reading as open or shorted, preventing the board from properly monitoring harvest cycle temperatures. As a failsafe, the unit will default to a 5-minute timed harvest cycle so it can continue producing ice while the fault is active. The thermistor and its wiring should be tested to resolve the underlying cause.

A reset may temporarily clear the blinking LEDs, but the error will return if the underlying thermistor or wiring issue has not been corrected. The control board detects the open or shorted thermistor circuit each time it attempts a harvest cycle, so the fault will reappear during normal operation. A proper repair requires diagnosing and correcting the thermistor circuit fault, not just resetting the unit.

Repair costs depend on which component has failed. A replacement evaporator thermistor typically ranges from around 15 to 50 dollars for the part alone. If a control board replacement is needed, parts alone can range from roughly 80 to 200 dollars or more depending on the model. Adding professional labor costs generally brings total repair estimates to somewhere between 100 and 350 dollars, depending on the diagnosis outcome and local service rates.

A knowledgeable DIYer can diagnose this fault by using a multimeter to check the resistance of the evaporator thermistor and inspecting the wiring harness for damage or loose connectors. If the thermistor tests as open or shorted, replacing it is a straightforward repair. However, if the wiring and thermistor check out and the fault remains, control board replacement is more complex and may warrant a professional technician.

The ice maker will continue to operate using a fixed 5-minute harvest cycle as a fallback, so it is not immediately dangerous to use. However, harvest timing may not be optimized for your specific conditions, which could result in incomplete ice release or reduced ice quality over time. It is best to diagnose and resolve the thermistor fault as soon as practical to restore proper operation.