GE Microwave Error Code F5

The F5 code on a GE microwave indicates a shorted humidity sensor. The humidity sensor monitors steam from food during sensor cooking cycles, and the control board has detected that the sensor circuit has an abnormally low resistance or a short to ground. This fault will typically disable sensor cooking functions and may prevent the microwave from operating normally.

A shorted humidity sensor primarily affects the sensor cooking modes that rely on steam detection. However, because the control board has flagged a fault, the microwave may not operate at all or may behave unpredictably. It is best not to rely on the appliance until the fault is properly diagnosed and repaired.

If only the humidity sensor needs replacement, parts typically range from around $20 to $60 depending on the model, with professional labor adding $75 to $150 or more. If the control board is also involved, total repair costs can rise to the $150 to $350 range. For older microwaves, it may be worth comparing the repair cost against the price of a replacement unit.

A knowledgeable DIYer can attempt this repair by first unplugging the microwave, then inspecting the humidity sensor connector and wiring harness for visible damage or corrosion. If the wiring appears intact, the humidity sensor can be tested with a multimeter and replaced if it shows a shorted reading. Keep in mind that microwave capacitors can hold dangerous voltages even when unplugged, so internal access should only be attempted by those familiar with high-voltage appliance safety precautions.

Unplugging the microwave for a few minutes may temporarily clear the F5 code, but the fault will return if the underlying problem with the humidity sensor or its wiring has not been corrected. A reset alone does not repair a shorted sensor circuit, so the error is likely to reappear during the next sensor cooking cycle or power-on self-test.