Whirlpool Microwave Error Code E3

The E3 code means the microwave has detected a short condition in the temperature sensor circuit. The temperature sensor normally reads approximately 1080 ohms of resistance at 70 degrees Fahrenheit, and the control board flags E3 when the measured resistance falls outside the valid range. This fault will typically disable cooking functions until the issue is resolved.

The microwave should not be used while displaying the E3 error. The temperature sensor provides critical feedback to the control system, and operating without a functioning sensor could allow the cavity to overheat without proper monitoring. The unit will typically refuse to run in this fault state, which is the intended safe behavior.

If the temperature sensor itself needs replacement, parts typically range from roughly 15 to 50 dollars depending on the specific model. Professional labor to diagnose and replace the sensor can add 75 to 150 dollars or more depending on your location and the service provider. If the issue is only a damaged wiring harness or dirty connector, repair costs may be lower since no parts are required.

A technician or knowledgeable DIYer can diagnose this fault by checking the sensor connector and measuring sensor resistance with a multimeter. At 70 degrees Fahrenheit the sensor should read close to 1080 ohms, increasing by about 2 ohms per degree above that. If the resistance is out of range, the sensor needs to be replaced. Keep in mind that microwave interiors contain high-voltage capacitors that can hold a dangerous charge even when unplugged, so proper discharge procedures are essential before reaching inside the unit.

Unplugging the microwave for a minute and restoring power may temporarily clear the displayed code, but the fault will return if the underlying sensor or wiring problem has not been repaired. A reset alone does not fix a shorted sensor or damaged harness. The correct resistance must be confirmed through measurement before the repair can be considered complete.