Whirlpool Microwave Error Code ERR 0

ERR 0 indicates a convection temperature sensor error. The control board has detected that the sensor circuit is either open, meaning the sensor is disconnected or has a broken wire, or short-circuited, meaning the sensor element has failed internally. This error prevents convection cooking from operating until the fault is corrected.

Standard microwave functions such as reheating and defrosting may still operate, but convection cooking should not be attempted while ERR 0 is active. The error exists specifically because the temperature monitoring system for the convection function is not working, which means the oven cannot regulate heat accurately during convection cycles. Using convection mode without a functioning sensor could result in overheating.

If the fix is simply reseating a loose connector, there is no parts cost involved. If the convection temperature sensor itself has failed, replacement sensor parts typically range from $20 to $60 depending on the specific model. If professional repair service is needed, total costs including labor generally range from $80 to $200, which makes it worth comparing against the cost of a replacement microwave for older units.

Start by checking that the convection temperature sensor connector is firmly seated at both the sensor and the control board. If the connection is secure, test the sensor with a multimeter for proper resistance. A reading of near-zero ohms or infinite resistance means the sensor needs to be replaced. If the sensor tests correctly, inspect the wiring harness for damage between the sensor and the control board.

Unplugging the microwave for a few minutes and restoring power may temporarily clear the error display, but the code will return as soon as the control board attempts to read the sensor circuit again. ERR 0 indicates a hardware fault, either a disconnected sensor or a failed component, that requires a physical repair rather than a reset to resolve permanently.