LG LWHD1006R Manual page 5

Grounding
The power cord is equipped with a 3-prong grounding plug. It also
incorporates an AFCI (Arc Fault Current Interrupter) as an integral part of
the power cord. If the TEST button does not trip or the RESET button does
not restore power, unplug the air conditioner and call an Authorized
Service Technician.
DO NOT tamper with or attempt to defeat or repair this device.
A faulty socket or bad connection can cause this device to trip.
LWHD1006R
p6