What F3 Means
F3 means the oven's temperature sensor (RTD) circuit is open — the control board has lost its reading from the sensor entirely, so it can't regulate heat.
Common Causes of F3
- Failed temperature sensor (RTD)
- Damaged or disconnected sensor wiring
- Corroded connector at the sensor or control board
🔧 One Safe Check You Can Try
There isn't a safe at-home test for this — it requires checking sensor resistance with a multimeter on a de-energized oven, which is technician work.
⚠ Why You Shouldn't Go Further Than That
- Testing the sensor's resistance requires a multimeter and a fully de-energized oven — skipping either step risks a shock.
- The sensor sits inside the cavity near the broil element; removing it without care can damage the surrounding insulation.
- A sensor swapped in slightly out of its original position reads inaccurately even when the part itself is fine, wasting the repair.
- This fault can be confused with a heating-element issue, leading to replacing the wrong, more expensive part.
- Cavity or rear-panel access to reach the sensor typically voids the remaining warranty.