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TROUBLESHOOTING
18.2 MAINTENANCE BEGINNING AND ENDING OF USE
Beginning of use
•
Remove obstacles for the air inlet grilles of indoor unit and
outdoor unit and the air outlet.
•
Check that the air filter is not clogged.
19 TROUBLESHOOTING
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 on panel
Temperature Irregularity
Turned ON "HOT-ST" on LCD
Flashing operation mode on LCD
Trouble
Not operated
Cooling
Operated
however,
stopped soon
Heating
28
PMML0552 rev.1 - 02/2021 - A10635790A
Phenomenon
All indication lamps on the wired controller
are turned OFF.
After Power Failure
During the heating operation.
At Beginning of Heating Operation Season
The indoor unit is used in a restaurant or a
kitchen.
During the dry operation
The cooling operation is performed in high
humidity environment.
The air flow from the indoor unit has odor.
Sound is heard when starting or stopping
the operation.
Sound which water flows or is boiled is
heard during the operation.
Growling sound may be heard temporarily
right after the air flow volume is changed.
Dew condensation occurs on the panel or
the cabinet or dew drops.
The air flow volume and temperature of
each air outlet are irregular.
Checking point
Check that the main power source is turned
ON.
Check that the fuse does not blow out or
the circuit breaker of main power source is
not tripped.
Check whether the air inlet and outlet of the
outdoor unit are not covered by a paper, a
vinyl or other object.
Check whether there are any obstacles for
the air flow near the air inlet and outlet of
the outdoor unit.
Check whether the outlet air is short-
circuited to the air inlet.
Ending of use
Clean the air filter, the air inlet grille and the flat panel.
Cause and action
The micro-computer is activated to protect the device from
electromagnetic waves. Restart the operation.
Restart the operation. If the instantaneous power failure is within two
seconds, the operation restarts automatically.
It may occur during the defrosting operation in the heating operation.
Dust attached to the heat exchanger has been dried.
Oil is attached to the fins and the heat exchange efficiency may be
decreased.
It may occur when the air outlet temperature becomes lower.
Raise the set temperature and the air flow volume.
It may occur because the cigarette smoke and room odor are stuck
inside the indoor unit.
Ventilate well by the fan mode and clean the air filter, the flat panel,
the air outlet and the air inlet grille. It may be effective for odor
eliminating.
It is generated because the resin parts are stretched by the
temperature change and rubbed with other parts.
It is generated because the refrigerant flows or the drain-up
mechanism drains water. Especially, sound may be heard when
starting the operation or stopping the compressor (for approx. 3
minutes).
It is generated because the fan motor makes temporary sound by
change of fan speed.
It may occur if the operation is performed in high humidity place
(relative humidity is approx. 80%.) for a long time.
This might occur for structural reasons, such as the size of air outlet
and the location of heat exchanger.
The indications may be turned ON or flash according to the operation
mode or condition.
Turn ON the main power source for air conditioner.
Replace the fuse or reset the circuit breaker.
If the trouble recurs, contact your contractor or distributor.
Remove objects covering the air inlet and outlet.
Remove the obstacles which prevent the air flow.
Action
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