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TROUBLESHOOTING
9 TROUBLESHOOTING
This is not abnormal
Operation Stopped
White Steam from Indoor Unit
White Smoke from Indoor Unit
Mist from Indoor Unit
Odor from Indoor Unit
Sound from Indoor Unit
Dew Condensation on Air
Panel
Temperature Irregularity
Turned ON "HOT-START" or "Preheating" on LCD
Operation Mode on LCD Flashing
8
PMML0549 rev.1 - 02/2021 - A10761230A
Phenomenon
All indication lamps on the remote control
switch are turned OFF.
"Motion Sensor is activated" is turned ON on
the remote control switch.
After Power Failure
During Heating Operation
At Beginning of Heating Operation Season
In Restaurant or Kitchen
During Dry Operation
During Cooling Operation in Humid
Environment
During Frost/Wash Operation
Odor Discharged Air from Indoor Unit
Grate is heard when starting or stopping the
operation.
Sound of water flowing or burbling is heard
during the operation.
Sound of something cracking is heard at the
beginning of operation.
Buzz is heard during Power-ON
Dew condensation on Air Panel or Cabinet or
Dew Drops
Dew condensation on Air Panel or Cabinet
during or after FrostWash
The air flow volume and temperature of each
air outlet are irregular.
Cause and Action
The micro-computer is activated to protect the device from
electromagnetic waves. Restart the operation.
The operation is stopped automatically because the motion
sensor is set as "If absent: Stop" and it detects as absence
for a period of time. (All the indoor units connected to the
same remote control switch are stopped.)
Restart the operation. If the instantaneous power failure is
within 2 seconds, the operation restarts automatically.
This might occur during the defrosting operation in the
heating operation.
This might occur when dust attached to the heat exchanger
has been dried.
This might occur when oil attached to the fins might decrease
the heat exchange efficiency.
This might occur when the air outlet temperature becomes
lower. Change the operation mode.
This might occur when the air outlet temperature becomes
lower.
Raise the set temperature and the air flow volume.
This might occur when frost is formed on the heat exchangers
fins
This might occur when the smell of cigarette smoke or room
stuck to the inside of the indoor unit.
Ventilate the unit well in the fan mode and clean the air filter,
the air outlet and the air inlet flat grille.
This is the sound made when the components are rubbing
against each other due to the extension and contraction of
the resin parts caused by the temperature change.
This is the sound made when the refrigerant flows or the
drain-up mechanism drains water. The sound may be heard
especially when starting the operation or stopping the
compressor (for approx. 3 minutes).
This is the sound made when water attached to the heat
exchanger partly freezes or melted during cooling operation.
This is the sound made when the noise occurs at the
electrical parts.
This might occur when the operation is performed in humid
place (relative humidity is approx 80%) for a long time.
This might occur when the operation is performed in humid
place (relative humidity is approx. 80%) and high temperature
place (higher than 30ºC).
This might occur for structural reasons, such as the size of air
outlet and the location of heat exchanger.
This might occur according to the operation mode or
operation conditions.
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