14
9.15
Hot air can be felt when the indoor
unit is stopped
• Several different indoor units are being run on
the same system. When another unit is running,
some refrigerant will still flow through the unit.
10.
Troubleshooting
If one of the following malfunctions occur, take the
measures shown below and contact your dealer.
WARNING
Stop operation and shut off the power if
anything unusual occurs (burning smells etc.)
Leaving the unit running under such
circumstances may cause breakage, electric
shock or fire. Contact your dealer.
The system must be repaired by a qualified
service person :
• If a safety device such as a fuse, a breaker or
an earth leakage breaker frequently actuates or
the ON/OFF switch does not properly work.
Measure: Turn off the main power switch.
• If water leaks from the unit.
Measure: Stop the operation.
• The operation switch does not work well.
Measure: Turn off the power.
• If the user interface display “
” indicates
the unit number, the operation lamp flashes and
the malfunction code appears.
Measure: Notify your installer and report the
malfunction code.
If the system does not properly operate except
for the above mentioned cases and none of the
above mentioned malfunctions is evident,
investigate the system according to the
following procedures. If it is impossible to fix
the problem yourself after checking all the
above items, contact your dealer.
Let him know the symptoms, system name,
and model name (listed on the warranty card).
1
If the system does not operate at all:
• Check if there is no power failure.
Wait unit power is restored. If power failure
occurs during operation, the system
automatically restarts immediately after the
power supply is recovered.
• Check if no fuse has blown or breaker has
worked. Change the fuse or reset the
breaker if necessary.
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.)
ON
OFF
Switch
Breaker
Trip position
2
If the system goes into fan only operation, but
as soon as it goes into cooling operation, the
system stops:
• Check if air inlet or outlet of outdoor or
indoor unit is not blocked by obstacles.
Remove any obstacle and make it well-
ventilated. Check if the user interface display
shows
“
”
time to clean the air filter).
Refer to “the operation manual of the indoor
unit and clean the air filter”.
3
The system operates but cooling or heating is
insufficient:
• Check if air inlet or outlet of outdoor or
indoor unit is not blocked by obstacles.
• Remove any obstacle and make it well-
ventilated.
• Check if the air filter is not clogged (refer to
“Maintenance” in the indoor unit manual).
• Check the temperature setting.
• Check the fan speed setting on your user
interface.
• Check for open doors or windows. Shut
doors and windows to prevent wind from
coming in.
• Check if there are too many occupants in
the room during cooling operation. Check if
the heat source of the room is excessive.
• Check if direct sunlight enters the room.
Use curtains or blinds.
• Check if the air flow angle is proper.
If the checking all above items, it is impossible to
fix the problem yourself, contact your installer and
state the symptoms, the complete model name of
the air conditioner (with manufacturing number if
possible) and the installation date (possibly listed
on the warranty card).
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