GE Refrigerator Error Code F8

The F8 code on a GE refrigerator indicates an Ambient Temperature Thermistor Invalid fault. It means the control board is detecting that the ambient thermistor is either shorted, open, or reading outside its normal operating range. The thermistor is a resistance-based temperature sensor, and when its output is invalid, the board triggers this code to alert the user to a sensor circuit problem.

The F8 code itself does not indicate an immediate safety hazard, but the refrigerator may not regulate temperature as accurately without a valid ambient thermistor input. Over time, this can affect food preservation and lead to additional component stress. It is best to diagnose and resolve the fault promptly rather than ignoring it.

A power reset may temporarily clear the F8 code, but if the thermistor or its wiring circuit is genuinely faulty, the code will return once the control board re-evaluates the sensor input. A reset is useful for ruling out a transient glitch, but a persistent F8 code requires physical diagnosis and likely component replacement to resolve permanently.

A knowledgeable DIYer can address the F8 code by first inspecting the thermistor wiring and connectors for visible damage or corrosion, then testing the thermistor's resistance with a multimeter. If the sensor reads open or shorted, replacing the ambient thermistor is a straightforward repair. If wiring damage is found, repairing or replacing the affected harness section may also resolve the fault.

If only the ambient thermistor needs replacement, parts typically cost in the range of $15 to $50 depending on the specific model, and the repair is relatively simple. If a technician is needed, labor charges can bring the total to roughly $100 to $200. Wiring harness repairs or a control board replacement would increase costs further, potentially ranging from $150 to $400 or more.