Frigidaire stove oven code F31 signals a temperature sensor failure or open circuit in the wiring. Most users clear the code by testing the sensor resistance and installing a new probe when values fall outside specifications. This approach avoids unnecessary control board replacements that often exceed the cost of the sensor itself.
Review Common F31 Sensor Failures
Frigidaire ovens trigger code F31 when the temperature sensor reports readings that the control board cannot interpret. The sensor operates as a thermistor that changes resistance with heat, and any break in continuity produces the fault immediately. Technicians see this code most often on ranges that have exceeded five years of daily use or after self-clean cycles that overheat the probe. Data from service records shows sensor replacement resolves 78 percent of F31 instances without further intervention. Wiring damage from rodents or door flexing accounts for the remaining cases.
Quick Look Table for F31 Errors
The F31 error code on Frigidaire stoves usually indicates problems with the temperature sensor in the oven. This quick look table outlines the key error details and initial troubleshooting actions for such faults. It allows for rapid assessment of sensor-related issues before further steps are taken.
The table below summarizes the most frequent triggers and their repair difficulty based on aggregated technician reports.
| Symptom | Primary Suspect | Difficulty 1-5 |
|---|---|---|
| F31 appears on preheat | Oven temperature sensor | 2 |
| F31 after self-clean | Damaged sensor wiring | 3 |
| F31 with no heat | Control board connection | 4 |
| Intermittent F31 | Loose harness at sensor | 2 |
Identify Root Cause of Code F31
The root cause traces to the oven temperature sensor losing proper resistance values between 1000 and 1100 ohms at room temperature. Heat from normal operation or self-clean cycles eventually cracks the sensor sheath or corrodes the terminals. When resistance spikes to infinity the control board registers the open circuit and displays F31. Less common but documented causes include pinched wires behind the oven liner or corrosion at the harness plug near the rear access panel. Confirming the exact failure point requires direct measurement before parts replacement.
Frigidaire F31 Temperature Sensor Resistance Test
Disconnect power to the range at the breaker. Remove the oven racks and unscrew the temperature sensor from the rear wall. Disconnect the harness plug and attach a multimeter set to ohms. Measure resistance at room temperature and compare against the 1000 ohm baseline. Heat the sensor tip with a hair dryer while watching for smooth resistance drop. Replace the sensor if readings stay fixed or exceed 1200 ohms. Reassemble and restore power to verify the code clears.
Frigidaire F31 Sensor Harness Inspection
Inspect the harness running from the sensor to the control board for visible breaks or melted insulation. Tug gently on each wire to detect internal breaks that do not show on the surface. Apply dielectric grease to the connector pins before reseating to prevent future corrosion. Route any loose sections away from sharp metal edges to avoid repeat damage during door operation.
Frigidaire F31 Sensor Resistance by Temperature
When troubleshooting the Frigidaire F31 error code on your stove oven the temperature sensor resistance must be measured against expected values. These measurements vary with temperature and indicate whether the sensor operates correctly. Proper verification prevents unnecessary part replacements during repair.
Service data lists expected resistance values at multiple temperatures for accurate diagnosis.
| Temperature F | Expected Resistance ohms |
|---|---|
| 70 | 1080 to 1100 |
| 350 | 1650 to 1700 |
| 500 | 2050 to 2100 |
Values outside these ranges confirm sensor failure regardless of visual condition.
Frigidaire F31 Temperature Sensor Replacement
When the Frigidaire stove shows the F31 error code a faulty temperature sensor is usually the cause. Replacing the sensor corrects the temperature reading problem and clears the fault from the control board. The procedure requires removing the oven racks and sensor mounting screws then swapping in the new part with the proper wiring connections.
Acquire the correct Frigidaire temperature sensor for the model series and install it following the test procedure above.
Hey, I’m Jake. I focus on cooling systems at Appliance Mastery, like fridges, freezers, and air conditioners.
I’ve worked in appliance repair for more than ten years and I’m certified through NASTeC. I’ve seen just about every fridge issue you can imagine.
My goal is to help you fix problems without stress. Whether it’s a freezer that won’t cool or an AC that keeps beeping, I’m here to walk you through it.