F3
Insignia
Oven Temperature Sensor Circuit Open
Display shows F3 and oven will not heat or shuts off shortly after starting a bake or broil cycle.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open oven temperature sensor (RTD), Broken sensor harness, Loose sensor connector at EOC, Corroded sensor terminals
How to Fix / Troubleshooting
Safety first: Turn off the range at the breaker before accessing internal wiring.
- Access the sensor: Inside the oven, locate the temperature sensor probe on the rear wall. Remove the mounting screws and gently pull the sensor forward to expose the connector.
- Check connections: Inspect the plug for corrosion or loose pins. Reseat the connector firmly.
- Test resistance: Disconnect the sensor and measure resistance with a multimeter. At room temperature (~77°F/25°C), it should be around 1080–1100 Ω. If the reading is infinite (open) or far off spec, replace the sensor.
- Check harness to EOC: If the sensor tests good, remove the rear panel and trace the sensor wires to the EOC. Look for breaks, burns, or loose connectors. Repair or replace the harness as needed.
- Replace EOC if needed: If sensor and wiring are good but F3 persists, the EOC input circuit may be faulty and the board should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Oven Temperature Sensor
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