F4
Haier
Oven Temperature Sensor Circuit Shorted
Haier range shows F4 and may shut off the oven mid-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
Shorted oven temperature sensor, Pinched or shorted sensor wiring harness, Moisture intrusion in sensor connector, Shorted input on control board
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before inspection.
- Inspect sensor and wiring: Remove the oven temperature sensor from inside the cavity. Check for damaged insulation, pinched wires, or signs of moisture.
- Resistance test: Disconnect the sensor and measure resistance with a multimeter. A shorted sensor will show very low resistance (near 0 Ω). Replace if shorted.
- Check harness for shorts: With the sensor removed, test continuity between each wire and chassis ground. Any continuity indicates a short to ground; repair or replace the harness.
- Control board check: If sensor and harness are good but F4 persists, the sensor input circuit on the EOC may be shorted. Inspect for burn marks; replace the control board if necessary.
Do not operate the oven with a known sensor fault, as temperature control will be inaccurate.
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Repair Difficulty
Hard
4/5
Required Part
Oven Temperature Sensor (RTD Probe)
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