F4
Hansa
Shorted Temperature Sensor Circuit
F4 error on oven display, oven 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 sensor element, Pinched sensor wires touching chassis, Moisture inside sensor connector, Faulty main PCB input
How to Fix / Troubleshooting
Safety first: Disconnect power before testing.
- Measure resistance: Disconnect the sensor and measure resistance. Very low resistance (near 0 Ω) indicates a shorted sensor.
- Inspect cable routing: Follow the sensor cable and ensure it is not pinched under panels or touching sharp metal edges. Correct routing and insulate as needed.
- Dry connectors: If there are signs of moisture, dry the connector and surrounding area thoroughly.
- Replace sensor: Install a new Hansa oven temperature sensor if the old one is shorted.
- PCB check: If a known-good sensor still results in F4, the main control board may have a shorted input and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Oven Temperature Sensor (NTC Probe)
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