Microwave displays F3 and may not allow cooking; sometimes associated with temperature sensing modes.

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, Open NTC sensor, Damaged sensor harness, Faulty control board input

Safety: Disconnect power before working on the unit.

Steps:

1. Power reset: Unplug for several minutes and retry. If F3 returns, proceed.
2. Locate and test NTC sensor: Access the cavity temperature sensor and measure its resistance at room temperature. Compare to specifications. Replace if shorted or open.
3. Inspect wiring: Check the harness from the sensor to the control board for cuts or pinched sections. Repair or replace as needed.
4. Control board: If sensor and wiring are good, the control board may be defective and require replacement.

Hard 4/5

Cavity Temperature Sensor (NTC)

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