What F8 Means
F8 points to an internal logic failure involving both the temperature sensor circuit and the control board — the board is receiving data it can't reconcile with expected values.
Common Causes of F8
- Failed temperature sensor feeding inconsistent data
- Control board logic fault
- Damaged wiring between the sensor and board
🔧 One Safe Check You Can Try
Power-cycle at the breaker for two minutes to rule out a temporary logic glitch before assuming a hardware fault.
⚠ Why You Shouldn't Go Further Than That
- This fault spans two components (sensor and board), and replacing one based on a guess when the other is at fault wastes the part.
- Testing either component requires the oven fully de-energized, and skipping that step risks a shock.
- The sensor and board share wiring routed near the cavity's high-heat zone, where nicked insulation is easy to introduce accidentally.
- A board or sensor reinstalled even slightly incorrectly can mask the fault temporarily, only for it to reappear mid-bake.
- Diagnosing this properly typically requires opening both the cavity and rear control housing, a common way this warranty gets voided.