Sirius Refrigerator Error Code FF

The FF code stands for fresh food thermistor failure. It means the control board detected an open or short circuit in the temperature sensor located in the fresh food compartment, either during startup or while the refrigerator was running. When this code appears at startup, all LEDs will blink every 0.5 seconds for 5 seconds as part of the diagnostic alert. The refrigerator may not cool the fresh food section properly until the fault is resolved.

Operating with an active FF code is not recommended for extended periods. Without a functioning fresh food thermistor, the control board cannot accurately regulate cooling in the fresh food section, which means food temperatures may rise to unsafe levels. You should address the fault promptly and monitor fresh food compartment temperatures if the refrigerator must remain in use temporarily.

Repair costs vary depending on the root cause. A replacement thermistor is generally an inexpensive part, typically in the range of $15 to $50, while professional labor for diagnosis and installation can add $75 to $150 or more. If the control board is at fault, costs increase significantly, often ranging from $150 to $400 or higher depending on the board and labor rates in your area.

Start by checking the thermistor's resistance at connector J1, pin 1, and comparing the reading to the thermistor resistance-temperature table at your current compartment temperature. If the resistance is infinite or near zero, the thermistor needs to be replaced. If the thermistor measures correctly, inspect the wiring harness and connector J1 for damage, corrosion, or loose pins before considering control board replacement.

A power reset may temporarily clear the code, but if the thermistor or its wiring is genuinely failed, the FF code will return on the next startup or shortly after, triggering the LED blinking sequence again. The underlying electrical fault in the thermistor circuit must be repaired for the code to stay cleared.