6 Troubleshooting
Operation manual
6
FDXM25~60F3V1B
Split system air conditioners
4P456959-1 – 2017.03
▪ Turn on the power at least 6 hours before operating the unit in
order to ensure smoother operation. As soon as the power is
turned on, the user interface display appears.
6
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 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.
Malfunction
Measure
If the system does not
operate at all.
▪ Check if there is no power failure. Wait
until power is restored. If power failure
occurs during operation, the system
automatically restarts immediately after
power is restored.
▪ Check if no fuse has blown or breaker is
activated. Change the fuse or reset the
breaker if necessary.
▪ Are batteries set in the remote controller?
▪ Is the timer setting correct?
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 obstacles and make sure
the air can flow freely.
▪ Check if the air filter is clogged. Contact
your dealer to clean the air filter.
▪ Check the temperature setting. Refer to
the manual of the user interface.
▪ Check if the air flow angle is proper.
Refer to the manual of the user interface.
▪ Check the fan speed setting is set to low
speed. Refer to the manual of the user
interface.
▪ Check for open doors or windows. Close
doors and windows to prevent wind from
coming in.
▪ Check if direct sunlight enters the room.
Use curtains or blinds.
▪ If the heat source of the room is
excessive (when cooling). Cooling effect
decreases if heat gain of the room is too
large.
▪ Check if there are too many occupants in
the room during cooling operation. Check
if the heat source of the room is
excessive.
Malfunction
Measure
Operation stops
suddenly. (Operation
lamp blinks.)
▪ Check if the air filter is clogged. Contact
your dealer to clean the air filter (refer to
"Maintenance" in the indoor unit manual).
▪ Check if air inlet or outlet of outdoor or
indoor unit is not blocked by obstacles.
Remove any obstacles, turn the breaker
OFF and back ON. If the lamp still blinks,
contact your dealer.
▪ Check if all indoor units connected to
outdoor unit in the multi-system are
operating in the same mode.
An abnormal function
happens during
operation.
▪ The air conditioner may malfunction
because of lightning or radio waves. Turn
the breaker OFF and back ON.
If after 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 unit (with manufacturing number if possible) and
the installation date (possibly listed on the warranty card).
6.1
Symptoms that are NOT system
malfunctions
The following symptoms are NOT system malfunctions:
6.1.1
Symptom: The system does not operate
▪ The air conditioner does not start immediately after the ON/OFF
button on the user interface is pressed. If the operation lamp
lights, the air conditioner is in normal condition. It does not restart
immediately because one of its safety devices actuates to prevent
the air conditioner from being overloaded. The air conditioner will
turn on again automatically after 3 minutes.
▪ The air conditioner does not start immediately after the power
supply is turned on. Wait 1 minute until the microcomputer is
prepared for operation.
▪ The air conditioner does not restart immediately when the
temperature setting button is returned to its former position after
pushing. It does not restart immediately because one of its safety
devices actuates to prevent the air conditioner from being
overloaded. The air conditioner will turn on again automatically
after 3 minutes.
▪ The outdoor unit has stopped. This is because the room
temperature has reached the set temperature. The unit switches
to fan operation. "
" (external control icon) is displayed on
the user interface and the actual operation is different from the
user interface setting. For multi-split models, the microcomputer
executes the following control depending on the operation mode
of other indoor units.
▪ The fan speed is different from the setting. Pressing the fan speed
control button does not change the fan speed. When the room
temperature reaches the set temperature in heating mode or the
unit’s maximum capacity is reached, the outdoor unit will stop
operation and the indoor unit will operate in fan only mode (low
fan speed). In case of multi-split, the indoor unit alternately
operates in fan stop mode and fan only mode (LL= low fan
speed). This is to prevent the cool air from being blown directly
onto anyone present in the room.
6.1.2
Symptom: White mist comes out of a unit
(Indoor unit)
▪ When humidity is high during cooling operation (in oily and dusty
places). If the interior of an indoor unit is extremely contaminated,
the temperature distribution inside a room becomes uneven. It is
