GE Refrigerator Error Code F43

The F43 error code on a GE refrigerator indicates that the appliance has detected three consecutive abnormal defrost cycles classified as FF (full freeze or failed freeze) events. The defrost system is responsible for periodically melting frost buildup on the evaporator coils, which is critical for maintaining proper airflow and cooling efficiency. When this cycle fails repeatedly, the control board logs each occurrence and triggers F43 after the third consecutive failure, signaling that the defrost system has a persistent, unresolved fault rather than an isolated anomaly.

The defrost system involves several key components working in sequence: the defrost heater, the defrost thermostat (also called a bimetal or limit thermostat), the defrost timer or adaptive defrost control board, and temperature sensors that confirm the coils have reached an appropriate defrost temperature. An abnormal cycle can result from any one of these components failing to perform correctly. The heater may not activate, the thermostat may open prematurely or fail to open at all, or the control board may misread sensor data and terminate the cycle early.

Because F43 requires three consecutive failures to trigger, intermittent faults that resolve on their own will not typically set this code. When it does appear, technicians should inspect the defrost heater for continuity, test the defrost thermostat, and verify that the evaporator temperature sensor is reading accurately. Heavy frost accumulation on the evaporator coils at the time of diagnosis is a strong indicator that the heater or thermostat circuit has broken down completely.