F4
Hitachi
Oven Temperature Sensor Short Circuit
Hitachi oven displays F4 and may overheat or not heat correctly
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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 wires shorted to chassis, Moisture inside sensor connector
How to Fix / Troubleshooting
Safety first: Disconnect power at the breaker before inspection.
- Visual inspection: Check the sensor probe inside the cavity for physical damage or signs of burning.
- Check wiring for shorts: Access the rear of the oven and trace the sensor wires. Ensure they are not pinched against metal or melted onto the oven liner.
- Measure resistance: Disconnect the sensor and measure its resistance. A very low reading (near 0 Ω) indicates a shorted sensor.
- Dry connectors: If there are signs of moisture or steam ingress at the connector, dry thoroughly and reseat the connector.
- Replace sensor: If the sensor is shorted, replace it with the specified Hitachi part. If wiring is damaged, repair or replace the harness section.
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Repair Difficulty
Medium
3/5
Required Part
Oven Temperature Sensor (NTC Probe)
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