Ilve oven shows F4 and will not start a cycle

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 NTC sensor, Sensor wires pinched to chassis, Moisture inside sensor connector, Failed EOC reading low resistance

Safety: Turn off power before testing.

Inspect sensor wiring: Remove rear panel and check that sensor wires are not crushed against metal or melted on the oven cavity.
Resistance test: Disconnect the sensor and measure resistance. A very low reading (near 0 Ω) indicates a shorted sensor. Replace it.
Connector check: Dry any moisture in the connector and ensure pins are not bridged by debris.
Control board: If a known-good sensor still results in F4, the EOC may be misreading the sensor and should be replaced.

Medium 3/5

Oven Temperature Sensor (NTC Probe)

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