Fan louvers do not
swing.
Check wire connections. Repair or tighten any
broken or loose connections.
When unit is turned on or off the outer
shell “pops” or “clicks.”
Normal sound. Outer shell is contracting or
expanding and will stop after a few minutes.
When unit is turned on or off “boiling”
or “running water” is heard.
Normal sound. The cause is refrigerant flowing
inside the system and will stop after a few minutes.
Foreign objects inside the unit are
interfering with fans or other moving
parts.
Tighten bolts holding compressor to chassis.
Room too cold (or too
hot.)
Set temperature is too low (or high.)
Adjust the set temperature.
Possible Causes and Solutions
LED blinks
once then off
for 3
seconds.
Indoor ambient
temperature sensor
is open/short
circuited.
Sensor connection is loose or disconnected.
Reconnect any loose or disconnected wires.
Sensor wire is damaged. Repair wire or replace
sensor.
Sensor is defective. Replace sensor.
Main PCB is defective. Replace PCB.
LED blinks
twice then off
for 3
seconds.
Evaporator
temperature sensor
is open/short
circuited.
Sensor connection is loose or disconnected.
Reconnect any loose or disconnected wires.
Sensor wire is damaged. Repair wire or replace
sensor.
Sensor is defective. Replace sensor.
Main PCB is defective. Replace PCB.
LED blinks
four times
then off for 3
seconds.
Condenser
temperature sensor
is open/short
circuited.
Sensor connection is loose or disconnected.
Reconnect any loose or disconnected wires.
Sensor wire is damaged. Repair wire or replace
sensor.
Sensor is defective. Replace sensor.
Main PCB is defective. Replace PCB.