LG Microwave Error Code E-29

E-29 is a sensor open error, meaning the main PCB has detected an open or broken circuit in the sensor connection. The microwave cannot receive a valid signal from the sensor, so it stops normal operation and displays this code. The first thing to check is whether the sensor housing is fully inserted into its connector on the main PCB.

It is not recommended to continue using the microwave while this error is active. The sensor open condition means the unit cannot properly monitor cooking conditions, which could result in overcooking, undercooked food, or unintended operation. Address the fault before resuming normal use.

If only the sensor connector needs to be reseated, there is no parts cost. Replacing a faulty humidity sensor typically costs between $15 and $50 for the part, depending on availability. If the main PCB requires replacement, costs can range from $80 to $200 or more for the component alone, and professional labor will add to the total.

If the sensor housing has simply become unplugged, reseating it into the main PCB connector may resolve the error without any parts or specialized tools. If the sensor itself has failed or the wiring harness is damaged, replacing those components requires basic electrical knowledge and comfort working inside the microwave cabinet. Always discharge the high-voltage capacitor before working inside any microwave.

A power reset by unplugging the unit for a few minutes may temporarily clear the error code, but it will return if the underlying open circuit condition has not been corrected. The sensor connection or the sensor itself must be physically inspected and repaired for the error to be resolved permanently.