Daikin FCQ24MVJU Operation Manual page 15

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 automati-
cally restarts immediately after the power sup-
ply recovers.
• Check if a fuse has blown.
Turn off the power supply.
• Is the breaker 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.)
Breaker
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-venti-
lated.
• 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 suffi-
ciently cool or heat.
• If the air inlet or outlet of the indoor or the out-
door unit is blocked with obstacles.
Remove the obstacle and make it well-venti-
lated.
• 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 (Refer to
ADJUSTMENT).
• If the FAN SPEED button is set to LOW
SPEED (Refer to ADJUSTMENT).
• If the air flow angle is not proper (Refer to AIR
FLOW DIRECTION ADJUST).
• If the doors or the windows are open. Shut
doors or windows to prevent wind from coming
in.
• If direct sunlight enters the room (when cool-
ing).
Use curtains or blinds.
ON
Switch
Trip position
OFF
• 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 cooling).
Cooling effect decreases if heat gain of the
room is too large.
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