LG Microwave Error Code E-0b

The E-0b code means the microwave detected that its internal PCB temperature exceeded 90 degrees Celsius while the cooling fan motor was not rotating. The microwave stops operation automatically to protect the control board and other electronics from heat damage. This is a cooling system fault that requires inspection of the fan motor and its drive circuitry.

No, you should not continue using the microwave while this error is active. The code indicates that the cooling system is not functioning, and running the microwave without proper cooling can cause permanent damage to the control board and magnetron. Leave the unit powered off until the fault is diagnosed and repaired.

Repair costs vary depending on what has failed. A replacement cooling fan motor typically costs between $20 and $60 for the part alone, while a new control board can range from $80 to $200 or more. Adding professional labor, total repair costs generally fall between $100 and $300, though this depends on the specific model and local labor rates.

Some causes, such as a blocked fan blade or a loose wiring connector, can be addressed without special tools by a careful DIYer after the unit is unplugged and discharged. However, microwave capacitors can store a lethal charge even when the unit is unplugged, so internal work should only be performed by someone familiar with high-voltage safety procedures. If the motor or PCB needs replacement, a qualified technician is recommended.

Unplugging the microwave and restoring power may temporarily clear the code, but the error will return as soon as the unit runs and the PCB temperature rises without the fan operating. The underlying cause, whether a failed motor, a wiring fault, or a PCB drive circuit issue, must be corrected for the error to stay clear.