Frigidaire F3 Error Code - Causes & Fix

Frigidaire F3 Error Code — What It Means

On Frigidaire electric ranges, the F3 code typically indicates a problem with the oven temperature sensor circuit or, on some models, a communication error between control components. Frigidaire’s official support documentation lists F3 (or F3/F20) as a communication error and recommends a power reset as the first step. However, field technicians also commonly encounter F3 as an open or faulty oven temperature sensor fault on many Frigidaire model families. The exact meaning depends on your specific model and control system, but both scenarios point to either a sensor circuit problem or a transient control communication issue.

The code usually appears when the electronic oven control cannot read the temperature sensor properly due to an open circuit, damaged wiring, a failed sensor probe, or a defective control board. In some cases, the fault is temporary and clears after a power cycle. If the code returns immediately or during heating, you have a hard fault in the sensor circuit or control.

Jump to Fix

Common Causes

• Loose or damaged sensor harness Wiring between the oven temperature sensor and the control board can become loose, burned, or corroded at the connectors, breaking the circuit and triggering the fault.
• Failed oven temperature sensor The RTD thermal probe itself can fail open or drift out of range, preventing the control from reading oven temperature.
• Defective electronic oven control board If the sensor and wiring test good, the control board may have a failed input circuit or component that cannot process the sensor signal.
• Transient communication fault On models where F3 or F3/F20 is a communication error, a temporary glitch between control components can set the code and may clear with a power reset.

Step-by-Step Fix

1. Verify the exact code and model. Check whether your display shows F3 alone or F3/F20, and note your range’s model number for reference during diagnosis.
2. Reset power to the range. Unplug the range or turn off the breaker for at least 30 seconds, then restore power and observe whether the code clears and stays away.
3. Disconnect power and access the sensor. If the code returns, turn off the breaker, remove the back panel or oven cavity panels, and locate the oven temperature sensor probe and its harness running to the control board.
4. Inspect the sensor wiring and connectors. Look for loose pins, burned insulation, or broken wires at both the sensor plug and the control board connector, and repair or replace any damaged harness sections.
5. Test the oven temperature sensor with an ohmmeter. Disconnect the sensor leads and measure resistance at room temperature. One service example shows a good probe reading around 1.0 to 1.1 kΩ, but consult your model’s service sheet for the correct range. Replace the sensor if it reads open or out of spec.
6. Replace the electronic oven control if the sensor tests good. If the sensor resistance is normal and wiring is intact, the control board input circuit is likely defective and the board should be replaced.
7. Reassemble, restore power, and verify. After any repair, put panels back, turn on the breaker, and run the oven through an idle and heat cycle to confirm the fault does not reappear.

Parts Often Needed

When to Call a Pro

Call a qualified appliance technician if you are not comfortable working with 240-volt wiring or accessing the control area safely. If you have replaced the sensor and inspected the wiring but the F3 code still appears, the control board likely needs diagnosis or replacement, and a technician can confirm the fault with specialized meters and service documentation. Professional help is also recommended if the fault is intermittent or if board-level component repair is required, since most homeowners do not have the tools or schematics for that work.