F4 error on oven display; oven may overheat or not heat correctly.

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.

Possible Causes

Shorted sensor element, pinched sensor wires touching chassis, moisture inside the sensor connector, faulty main PCB input.

Safety first: Disconnect power before testing.

Measure resistance: Disconnect the sensor and measure its 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 the routing and insulate as needed.
Dry connectors: If there are signs of moisture, thoroughly dry the connector and surrounding area.
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 an F4 error, the main control board may have a shorted input and require replacement.

Medium 3/5

Oven Temperature Sensor (NTC Probe)

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