DIAGNOSIS No power to the control board. The primary suspects are the power cord, the internal fuse on the control board, or a wiring disconnect from transport.
FIX First, verify the power cord is fully seated in the socket on the back of the unit. It can work loose. Next, check the household circuit breaker or GFCI outlet. Plug a lamp into the same outlet to confirm power. If power is confirmed, locate the unit's power switch. It is a physical rocker switch, often on the lower back or side near the power cord inlet. Ensure it is in the "I" (On) position.
IF THAT DIDN'T WORK The internal 3A or 5A fuse on the main control PCB may be blown. This requires opening the chassis. Unplug the unit. Remove the rear service panel. Locate the glass or ceramic fuse holder on the PCB. Test the fuse with a multimeter for continuity. Replace with an identical amperage and type fuse if blown.
HEADS UP A blown internal fuse indicates a power surge or a short circuit. If a new fuse blows immediately upon plugging in, a major component like the compressor or fan motor has failed. Do not keep replacing fuses.