F4
Thor Kitchen
Oven Temperature Sensor Circuit Shorted
Display shows F4, oven may not start or may shut off unexpectedly.
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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
Shorted temperature sensor, Sensor wiring shorted to chassis, Melted harness insulation near oven cavity, Failed EOC sensing circuit
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker and allow the oven to cool fully before working.
- Inspect sensor and wiring: Remove the oven back panel. Follow the sensor wires from the probe to the control board. Look for melted insulation, bare wires touching metal, or signs of overheating.
- Test sensor resistance: Disconnect the sensor and measure resistance. A reading near 0 Ω indicates a shorted sensor; replace it.
- Check harness for shorts: With the sensor disconnected at both ends, test each wire to chassis ground with a multimeter. Any continuity indicates a short to ground; repair or replace the harness.
- Control board check: If sensor and wiring are good but F4 persists, the EOC input circuit may be shorted internally. Replace the electronic oven control board.
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Repair Difficulty
Hard
4/5
Required Part
Oven Temperature Sensor
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