Sharp Microwave Error Code EE39

EE39 on a Sharp microwave means the appliance has detected a food load that is too small for its sensor cooking system to operate with. The microwave monitors conditions inside the cavity to confirm an adequate load is present before running. This is a protective feature, and the code typically appears when very little or no food is placed inside during a sensor cooking cycle.

The EE39 code is primarily a protective alert rather than a critical safety failure. It prevents the magnetron from operating under conditions where the load is too small for the sensor system to manage accurately, which can help avoid component stress. The microwave is designed to stop operation and display this code rather than continue running improperly.

If the issue is simply a small food load or a dirty sensor, there is no parts cost involved. If the humidity sensor needs replacement, parts and labor could range from around $75 to $175 depending on the specific model and service rates in your area. A control board replacement is a more significant repair, typically ranging from $150 to $300 or more, and it may be worth comparing that cost against purchasing a replacement unit.

Start by ensuring you have a sufficient amount of food in the cavity before starting a sensor cooking program. If the error still appears, try switching to manual timed cooking instead of an automatic sensor mode. Clean the interior of the microwave, paying attention to the humidity sensor, to remove any grease or residue that could affect readings. If none of these steps resolve the issue, the sensor or control board may require inspection or replacement.

Unplugging the microwave for one to two minutes and plugging it back in may clear the EE39 code temporarily. However, if the underlying cause, such as insufficient food load or a dirty sensor, is not addressed, the code is likely to return the next time a sensor cooking cycle is used. Resolving the root cause is the only reliable way to prevent recurrence.