GE Refrigerator Error Code F43

F43 means the refrigerator has logged three consecutive abnormal defrost cycles. The control board monitors each defrost event, and when the defrost system fails to complete a normal cycle three times in a row, it triggers this code. The most likely causes are a failed defrost heater, a faulty defrost thermostat, or a bad evaporator sensor. This code will not appear from a single isolated defrost failure.

Continued use is possible in the short term, but the refrigerator will progressively lose cooling efficiency as frost accumulates on the evaporator coils. Eventually, the airflow blockage can cause both the freezer and fresh food sections to warm up significantly. Food safety becomes a concern as temperatures rise, so it is advisable to address the F43 code promptly rather than ignoring it.

A power reset may temporarily clear the code from the display, but it will return if the underlying defrost system problem has not been repaired. Because F43 requires three consecutive failed defrost cycles to trigger, the code will reappear once the refrigerator attempts and fails additional defrost cycles. Clearing the code without repairing the root cause does not fix the issue and can allow further frost buildup to occur.

Some diagnostic steps are accessible to experienced DIYers, such as checking for heavy frost buildup on the evaporator coils or testing the defrost heater and thermostat with a multimeter for continuity. However, accessing the evaporator coils typically requires removing freezer panels, and replacing components like the defrost heater or control board involves working with electrical connections. If you are not comfortable with appliance disassembly and electrical testing, a qualified technician is recommended.

Repair costs vary depending on which component has failed. A defrost heater or thermostat replacement is typically a lower-cost repair, often ranging from around $100 to $250 including parts and labor. If the defrost control board or main control board needs replacement, costs can range from $200 to $400 or more. Getting a diagnosis from a technician first is the best way to understand the specific cost for your situation.