Troubleshooting - Mitsubishi Electric Mr. SLIM PLH-P-AAH Série Manuel D'utilisation

4. Troubleshooting

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Before you call out a repair man, check the following table to see whether there is a simple solution to your problem.
[for wireless remote controller]
Problem
Unit does not operate at all.
[for wired remote controller]
Problem
Unit does not cool or heat very well.
The unit stops operating before arriving
at the set temperature in the heating
mode.
The airflow direction suddenly changes.
4
A white mist is expelled from the indoor
unit.
The indicators of the remote controller do
not light up when operated.
NOTE: After a power cut, the unit will not restart automatically. You will have to restart it by pressing the POWER - ON/OFF button on the remote controller.
If none of the above apply, turn the main switch off and contact the dealer from whom you bought the air-conditioner, telling him the model name and the nature of the problem.
Do not try to fix the unit yourself.
In any of the following cases, turn off the main power switch
and contact your local dealer for service:
• The operation lamp (on the main unit) flashes.
• The switches do not work properly.
• The circuit breaker trips frequently (or the fuse blows frequently).
• Water has accidentally been splashed into the unit.
• Water leaks from the unit.
• Something is accidentally dropped into the air-conditioner.
• An unusual noise is heard during operation.
The following do not indicate any malfunction:
Odours: smells such as tobacco or cosmetic odours may persist after they have been sucked into the unit.
Sound of liquid flowing inside indoor unit: this can occur during or after operation and is simply the sound of refrigerant being circulated inside the unit.
Ticking sound coming from indoor unit: this can occur when cooling or heating has just begun or has just stopped. It is caused by the indoor unit shrinking or expanding slightly
due to the change in temperature.
The message "CENTRALLY CONTROLLED" appearing on the LCD panel: from time to time, this message may come up on the LCD panel. This does not indicate any
malfunction.
Remote Controller Settings for Installing/Replacing Batteries and Restarting Operation (for wireless remote con-
troller)
• Always press the reset button after installing or replacing batteries.
• The initial settings are used when installing or replacing batteries after which the settings for restarting are used.
Operating mode
Temperature setting
Fan speed
Airflow direction
NOTE: The refrigerant charged in the air conditioner is safe. Refrigerant normally does not leak, however, if refrigerant gas leaks indoors, and comes into contact
with the fire of a fan heater, space heater, stove, etc., harmful substances will be generated.
Be sure to ask the service representative whether there is refrigerant leakage or not when repairs are carried out.
Warning:
If the air conditioner operates but does not cool or heat (depending on model) the room, consult your dealer since there may be a refrigerant leak. Be sure to ask
the service representative whether there is refrigerant leakage or not when repairs are carried out.
The refrigerant charged in the air conditioner is safe. Refrigerant normally does not leak, however, if refrigerant gas leaks indoors, and comes into contact with the
fire of a fan heater, space heater, stove, etc., harmful substances will be generated.
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Solution
Turn main power on. Then press the
POWER ON/OFF button to turn the unit
on.
Wait until power is restored, then press
the POWER ON/OFF button to turn the
unit on.
Solution
Clean the filter.
Frost forms when the outdoor tempera-
ture is low and humidity is high. Wait for
about 10 minutes for the frost to melt.
After one hour of cooling-mode opera-
tion with the airflow in a downward direc-
tion, the unit will automatically change to
the "Horizontal airflow" mode.
When the unit is in the heating or defrost-
ing mode, it will automatically change to
the "Horizontal airflow mode".
This may occur just after the unit is turned
on when a high level of humidity is
present in the room.
Turn on the power switch. " · " will be dis-
played.
Initial Settings
Fan Previous operating mode
— Previous temperature setting
High Previous fan speed setting
Level Operating mode
Problem
Unit does not start immediately.
Problem
CENTRALLY CONTROLLED is dis-
played in the remote controller.
The start and stop functions are not avail-
able just after restarting the unit.
"H0" is displayed in the remote control-
ler.
An error code is displayed in the remote
controller.
The operating display of the wireless re-
mote controller's receiver is flashing.
Operating range
Indoor air intake temperature Outdoor air intake temperature
Maximum 35 °C DB, 22.5 °C WB
Cooling
Minimum 19 °C DB, 15 °C WB
Maximum 28 °C DB
Heating
Minimum 17 °C DB
Restarting
Cooling - Dry
Heating
Fan
Solution
Wait until the unit restarts automatically.
The compressor may hesitate resuming
because a three-minute resume preven-
tion circuit is incorporated in the outdoor
unit for protection of the compressor.
Solution
The start and stop functions of the remote
controller are not available when the
CENTRALLY CONTROLLED message is
lit.
Wait about three minutes (operation has
stopped to prevent damage to the air con-
ditioner).
An automatic startup test is being per-
formed (will last for about two minutes).
A self-diagnostic function is being per-
formed to preserve the air conditioner.
∗ Do not attempt to make repairs your-
self. Turn the main switch off and con-
tact the dealer from whom you bought
the air conditioner. Provide him or her
with the name of the unit and the infor-
mation displayed in the remote control-
ler.
46 °C DB
–5 °C DB
24 °C DB, 18 °C WB
–11 °C DB, –12 °C WB
Level
Previous setting
Level