How to Fix / Troubleshooting

Safety first: Disconnect power and allow the oven to cool fully.

Inspect sensor and wiring: Remove the rear panel or top cover to access the sensor wiring. Look for melted or crushed insulation where the harness passes near the hot cavity.
Resistance test: Disconnect the sensor and measure resistance. A reading near 0 Ω indicates a shorted sensor. Replace it.
Check for chassis shorts: With the sensor disconnected, measure resistance between each sensor lead and the oven chassis. Any low resistance indicates a shorted wire; repair or replace the harness.
Dry connectors: If there are signs of moisture or steam ingress, dry the connectors thoroughly and apply a small amount of dielectric grease to protect contacts.
Replace parts: Install a new oven temperature sensor or sensor harness as needed.

After repair: Run a test bake and verify that the oven reaches and maintains the set temperature without error.

Oven does not reach set temperature; display may show F4 after a period of heating.

Possible Causes