Troubleshooting - Mitsubishi Electric PCA-RP·GA Operation Manual

4. Troubleshooting

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 ar-
riving at the set temperature in the
heating mode.
The airflow direction suddenly
changes.
A white mist is expelled from the in-
door unit.
The indicators of the remote control-
ler 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.
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 tem-
perature is low and humidity is high.
Wait for about 10 minutes for the frost
to melt.
After one hour of cooling-mode op-
eration with the airflow in a down-
ward direction, the unit will automati-
cally change to the "Horizontal air-
flow" mode.
When the unit is in the heating or de-
frosting 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 hu-
midity is present in the room.
Turn on the power switch. " · " will be
displayed.
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
available just after restarting the unit.
"H0" is displayed in the remote con-
troller.
An error code is displayed in the re-
mote controller.
The operating display of the wireless
remote controller's receiver is flash-
ing.
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 automati-
cally. The compressor may hesitate
resuming because a three-minute
resume prevention circuit is incorpo-
rated in the outdoor unit for protec-
tion of the compressor.
Solution
The start and stop functions of the
remote controller are not available
when the CENTRALLY CONTROL-
LED message is lit.
Wait about three minutes (operation
has stopped to prevent damage to
the air conditioner).
An automatic startup test is being
performed (will last for about two min-
utes).
A self-diagnostic function is being
performed to preserve the air condi-
tioner.
* Do not attempt to make repairs
yourself. Turn the main switch off
and contact the dealer from whom
you bought the air conditioner. Pro-
vide him or her with the name of the
unit and the information displayed
in the remote controller.
46 °C DB
–5 °C DB
21 °C DB, 15 °C WB
–11 °C DB, –12 °C WB
Level
Previous setting
Level
7