Bosch range oven shows F4 and may shut down heating prematurely.

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 in sensor connector, Faulty control board input

Safety first: Disconnect power before working on the oven.

Visual inspection: Remove the oven's rear panel and inspect the sensor wiring for pinched or bare wires touching metal.
Test sensor resistance: Disconnect the sensor and measure resistance. A very low reading (near 0 ohms) indicates a shorted sensor; replace it.
Dry connectors: If there was a steam or liquid event, dry the sensor connector thoroughly.
Replace control board: If the sensor and wiring are good, the electronic oven control may be faulty.

Medium 3/5

Oven Temperature Sensor

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