Whirlpool Microwave Error Code ERR A

ERR A means the microwave's control board is not detecting a wheel in the weight sensor system. This sensor is used by the automatic weight-sensing cooking feature to measure food weight and determine cook time. The error typically points to a missing, damaged, or obstructed sensor wheel, or a fault in the sensor assembly itself.

Unplugging the microwave for a few minutes may temporarily clear the ERR A display, but the code will return if the underlying hardware problem is not corrected. A reset does not fix a missing, broken, or obstructed sensor wheel. It can be useful for confirming whether the fault is persistent or intermittent.

If the fix is as simple as repositioning a dislodged wheel or cleaning debris, there may be no parts cost at all. If the sensor wheel or the full sensor assembly needs replacement, parts costs typically range from around $15 to $60 or more depending on the specific model, plus any applicable labor charges if a technician is hired. Evaluating whether the repair cost makes sense relative to the age and value of the microwave is always a good idea before proceeding.

In many cases, yes. Start by unplugging the microwave and inspecting the turntable area and weight sensor zone for a dislodged or visibly broken wheel. If the wheel is simply out of position, reseating it may clear the error. If there is debris blocking the wheel, a thorough cleaning of the sensor area may resolve it. If the wheel is broken or the sensor assembly is faulty, replacement parts will be needed, and some comfort with appliance repair is helpful for that work.

Basic microwave heating functions may still operate even with ERR A displayed, since the error is isolated to the weight sensor system. However, any cooking mode that relies on automatic weight sensing will not work correctly. Using the microwave in manual mode is generally safe, but the root cause should be investigated to prevent further component damage.