The F3 error on your Frigidaire means the oven’s temperature sensor (also called the RTD probe) has failed or is sending a signal outside the normal range. This usually stops the oven from heating properly, but it’s often fixable by checking or replacing the sensor.

Error code F3
Meaning Oven temperature sensor (RTD) circuit open or shorted
Severity Medium — oven won’t heat correctly or may shut off until fixed
Time to fix 15–45 minutes
Tools needed Multimeter, screwdriver

What the F3 error means

Frigidaire ovens use a temperature sensor (RTD) mounted at the back of the oven cavity to monitor internal temperature and relay it to the control board. When the board detects a reading that’s too high, too low, or missing entirely, it triggers the F3 code and often disables the heating elements as a safety measure.

This is one of the most common oven fault codes because the sensor is exposed to constant heat cycling, which can wear out its internal wiring over time.

Common causes

  • Faulty or degraded temperature sensor (RTD probe)
  • Loose or corroded wiring connection at the sensor or control board
  • Sensor touching the oven wall, giving an inaccurate reading
  • Damaged wire harness from heat exposure
  • Failed main control board (less common)
  • Power surge or brief electrical fault resetting the sensor circuit

How to fix the F3 error

  1. Power cycle the oven: Turn off the oven at the breaker for 5 minutes, then restore power. This clears temporary faults and lets the control board re-read the sensor.
  2. Check the sensor position: Open the oven and make sure the temperature sensor probe isn’t touching the oven wall or a rack. It should hang freely in the cavity.
  3. Inspect the wiring: With power disconnected, check the sensor’s wire harness for burns, fraying, or a loose connector at the back of the oven or control board.
  4. Test the sensor with a multimeter: At room temperature, the sensor should read around 1,080 ohms (check your model’s spec sheet for exact figures). A reading of zero or infinite resistance means it needs replacing.
  5. Replace the sensor: If testing confirms a fault, order the correct RTD sensor for your model and swap it in — this is a straightforward DIY job with basic tools.
  6. Call a technician if the error persists: If the sensor tests fine and the code keeps returning, the main control board may be at fault and should be checked by a professional.

FAQ

Can I still use my oven if it shows F3?
It’s best not to. The oven may not heat accurately or could shut off mid-cook, which can affect food safety and cooking results.

Is the F3 error expensive to fix?
Usually not. A replacement temperature sensor typically costs a modest amount and takes under an hour to install yourself.

Will resetting the breaker fix F3 permanently?
Sometimes, if it was a one-off electrical glitch. But if the code returns after a few uses, the sensor or wiring likely needs attention.