Frigidaire Oven F3: Temperature Sensor Circuit Open
What F3 Means
F3 specifically means the control board reads infinite resistance on the temperature sensor circuit. Unlike F1 (which covers multiple board faults), F3 points directly to the temperature sensor or its wiring. The sensor element has fractured, a wire has broken, or the connector has separated.
Do You Have the Right Tools?
Combustion analyzer ($300), igniter tester ($120), temperature calibrator ($150), and gas pressure manometer. Our technician arrives with $15K+ in professional tools — your diagnostic is free.
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The RTD Sensor
Frigidaire ovens use an RTD (Resistance Temperature Detector) sensor, not an NTC thermistor. The RTD is a long thin metal probe extending into the oven cavity from the top rear wall. The principle: a platinum or nickel element changes resistance linearly with temperature. At room temperature: 1,080-1,090 ohms. At 350F: approximately 1,540 ohms. At 550F: approximately 1,840 ohms.
An open circuit (infinite ohms) means the element wire inside the probe has fractured. This is permanent and the sensor must be replaced.
Quick Diagnosis
- Turn off the breaker. Access the sensor connector behind the oven (pull the oven away from the wall or access through a rear panel).
- Disconnect the two-pin connector. Measure resistance across the sensor leads.
- Infinite = sensor failed. Replace it. 1,080-1,090 ohms at room temperature = sensor is fine, check the wiring.
- If the sensor is fine, measure continuity from the sensor connector back to the board connector. An open wire between them produces the same F3 reading.
Safety First — Know the Risks
Gas ovens involve live gas lines — a loose connection creates explosion and carbon monoxide risk. Electric ovens run on 240V circuits. Our techs are licensed and insured — let them handle the risk.
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Sensor Replacement
Part: 316490000 or model-specific, $15-$30.
The sensor mounts to the rear oven wall with one or two screws accessible from inside the cavity. Its wire exits through a grommet in the rear wall. From behind the oven, disconnect the old connector, remove the rear mounting hardware (if any), and pull the sensor out from inside the oven.
Thread the new sensor from inside the cavity, through the grommet, and connect at the rear. Secure the mounting hardware. The entire process takes 15-20 minutes.
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Why Sensors Fail
The sensor operates continuously at oven temperatures up to 550F (higher during self-clean at 900F). Repeated thermal cycling causes metal fatigue in the platinum element. Self-clean cycles are particularly stressful. Average sensor lifespan: 8-12 years, shorter if self-clean is used frequently.
The Real Cost of DIY
Average DIY attempt: $150-400 in tools you may use once, plus the risk of further damage. Our diagnostic visit costs $0 — we find the problem and give you an honest quote.
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Cost
| Component | Parts | Professional Total |
|---|---|---|
| Temperature sensor | $15-$30 | $95-$145 |
| Wiring repair | $5-$15 | $100-$160 |
| Board (rare for F3) | $100-$300 | $200-$420 |
FAQ
Can I bake without the temperature sensor? No. The oven cannot regulate temperature without the sensor. It will not heat at all with F3 active because the board refuses to power the elements without temperature feedback.
F3 and F4 appear together. What does that mean? F4 means sensor shorted (low resistance). F3 and F4 together suggest an intermittent connection that alternates between open and shorted, usually a damaged wire with exposed copper contacting the oven chassis.
Does F3 affect the stovetop? On gas ranges, no. On electric ranges where the ERC controls the cooktop, F3 typically only disables the oven while leaving surface elements functional.
Frigidaire oven F3 is usually a quick sensor swap. Our technicians carry common Frigidaire oven sensors. Book a repair.
