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Issue Possible Causes
Poor cooling
performance
Temperature setting may be higher than am-
bient room temperature
Lower the temperature setting
The heat exchanger on the indoor or outdoor
unit is dirty
Clean the affected heat exchanger
The air filter is dirty
Remove the filter and clean it according to in-
structions
The air inlet or outlet of either unit is blocked
Turn the unit off, remove the obstruction and turn
it back on
Doors and windows are open
Make sure that all doors and windows are closed
while operating the unit
Excessive heat is generated by sunlight
Close windows and curtains during periods of
high heat or bright sunshine
Too many sources of heat in the room
(people, computers, electronics, etc.)
Reduce amount of heat sources
Low refrigerant due to leak or long-term use
Check for leaks, re-seal if necessary and top off
refrigerant
SILENCE function is
activated
SILENCE function can lower product perfor-
mance by reducing operating frequency. Turn off
SILENCE function.
The unit is not
working
Power failure
Wait for the power to be restored
The power is turned off
Turn on the power
The fuse is burned out
Replace the fuse
Remote control batteries are dead
Replace batteries
The unit’s 3-minute protection has been acti-
vated
Wait three minutes after restarting the unit
Timer is activated
Turn timer off
The unit starts and stops
frequently
There’s too much or too little refrigerant in the
system
Check for leaks and recharge the system with
refrigerant
Incompressible gas or moisture has entered
the system
Evacuate and recharge the system with refriger-
ant
The compressor is broken
Replace the compressor
The voltage is too high or too low
Install a manostat to regulate the voltage
Poor heating
performance
The outdoor temperature is extremely low
Use auxiliary heating device
Cold air is entering through doors and win-
dows
Make sure that all doors and windows are closed
during use
Low refrigerant due to leak or long-term use
Check for leaks, re-seal if necessary and top off
refrigerant
Indicator lamps continue
flashing
Error code appears in
the window display of
indoor unit:
• E0, E1, E2…
• P1, P2, P3…
• F1, F2, F3…
The unit may stop operation or continue to run safely. If the indicator lamps continue to flash or error
codes appear, wait for about 10 minutes. The problem may resolve itself. If not, disconnect the pow-
er, then connect it again. Turn the unit on.
If the problem persists, disconnect the power and contact an authorized service provider.
TROUBLESHOOTING
21


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