LG Microwave Error Code E-01

E-01 on an LG microwave indicates a sensor error that occurs during a sensor cook or temperature-based cooking process. The control board has detected that the sensor's resistance is incorrect or that it is not receiving a valid signal from the sensor circuit. Common causes include a loose shield wire connector, a dirty sensor filter, or a failed sensor. The error prevents the microwave from completing automatic sensor cooking cycles.

When E-01 is active, the sensor cooking functions are unreliable or non-operational, meaning automatic cooking adjustments will not work correctly. Basic timed cooking may still function depending on how the error presents, but sensor-based modes should not be trusted until the fault is resolved. It is best to address the error before relying on the appliance for regular use.

Repair costs depend on which component is at fault. Cleaning the sensor filter costs nothing beyond your time. A replacement humidity or temperature sensor typically ranges from $20 to $60 for the part alone. If a control board replacement is needed, parts can range from $80 to $200 or more. Adding professional labor generally brings total repair costs to between $100 and $300 depending on the specific failure and your location.

Some causes of E-01 are DIY-friendly. Cleaning the sensor filter and reseating the shield wire connector are straightforward tasks that require no special tools. However, measuring sensor resistance requires a multimeter and comfort with reading technical specifications. Replacing the sensor or control board involves working inside the microwave cabinet, which should only be done after unplugging the unit and allowing the capacitor to discharge.

Unplugging the microwave for a few minutes and restoring power may temporarily clear the E-01 code, but the error will return if the underlying problem is not fixed. A loose connector, dirty filter, or failed sensor will continue to generate the fault during sensor cooking cycles. A reset is useful for confirming whether the issue is intermittent, but it is not a repair.