What F4 Means
F4 means the oven's temperature sensor (RTD) circuit is shorted — the sensor is sending a signal the control board recognizes as invalid, rather than no signal at all.
Common Causes of F4
- Failed temperature sensor (RTD) sending a shorted signal
- Damaged sensor wiring insulation causing an internal short
- Moisture intrusion into the sensor connector
🔧 One Safe Check You Can Try
There isn't a safe at-home test for this — sensor circuit testing requires a multimeter on a de-energized oven, which is technician work.
⚠ Why You Shouldn't Go Further Than That
- A shorted sensor circuit can still carry voltage to the connector; testing it without full power isolation is a shock risk.
- The sensor sits inside the cavity near the broil element, and prying it out without the right technique can damage surrounding insulation.
- This fault looks similar to a heating element issue from the outside, and replacing the wrong part is a common, expensive mistake.
- A sensor reinstalled even slightly out of position continues to read inaccurately even after replacement.
- Rear panel access to trace the wiring for a short typically voids the remaining warranty.
Still Seeing F4?
Book a factory-trained technician and get it diagnosed correctly the first time — no guesswork, no repeat visits.