GE Refrigerator Error Code F79

The F79 error code on a GE refrigerator indicates that the control board is not receiving a signal from the hot water temperature and pressure (T&P) switch. This switch is a safety sensing component that monitors the temperature or pressure conditions in the hot water circuit within the appliance. When the control board expects a signal from this switch and finds the input missing or out of range, it triggers the F79 fault to alert the technician that the circuit is open, disconnected, or that the switch itself has failed.

The T&P switch is typically a normally closed or normally open contact device depending on the design. When the wiring harness connection becomes loose, corroded, or broken, the control board reads no signal and logs the fault. Similarly, if the switch itself has failed internally, the same open-circuit condition is presented to the board. The diagnostic process begins by physically inspecting the switch and tracing the wiring from the switch back to the control board connector.

Common contributing factors include vibration-related connector loosening over time, moisture or corrosion at the switch terminals, and outright switch failure due to thermal cycling stress. Because this error directly involves a safety-related sensing component, the fault should not be ignored or simply reset without identifying the underlying cause. Clearing the code without resolving the root issue will result in the code returning and may mask a developing condition in the hot water circuit.