English
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II. If the system does not properly operate except for
the above mentioned case, and none of the above
mentioned malfunctions is evident, investigate the
system according to the following procedures.
1. If the system does not operate at all.
• Check if there is a power failure.
Wait until power is restored. If power failure occurs during
operation, the system automatically restarts immediately
after the power supply recovers.
• Check if no fuse has blown.
Turn off the power supply.
• Check if the breaker is
blown.
Turn the power on with
the breaker switch in the
off position.
Do not turn the power on
with the breaker switch in
the trip position.
(Contact your dealer.)
2. If the system stops operating after operating the
system.
• Check if the air inlet or outlet of outdoor or indoor unit is
blocked by obstacles.
Remove the obstacle and make it well-ventilated.
• Check if the air filter is clogged.
Ask a qualified service person to clean the air filters
(Refer to MAINTENANCE).
3. The system operates but it does not sufficiently
cool or heat.
• If the air inlet or outlet of the indoor or the outdoor unit is
blocked with obstacles.
Remove the obstacle and make it well-ventilated.
• If the air filter is clogged.
Ask a qualified service person to clean the air filters
(Refer to MAINTENANCE).
• If the set temperature is not proper.
• If the FAN SPEED button is set to LOW SPEED.
• If the airflow angle is not proper (Refer to AIRFLOW
DIRECTION ADJUST).
• If the doors or the windows are open. Shut doors or win-
dows to prevent wind from coming in.
• If direct sunlight enters the room (when cooling).
Use curtains or blinds.
• When there are too many inhabitants in the room (when
cooling).
Cooling effect decreases if heat gain of the room is too
large.
• If the heat source of the room is excessive (when cool-
ing).
Cooling effect decreases if heat gain of the room is too
large.
Breaker
(ground fault circuit interrupter)
ON
OFF
Switch
Trip position
01_EN_3PN07753-16V.fm Page 7 Thursday, September 15, 2011 7:13 PM
