Trouble Shooting - Mitsubishi Electric Mr.SLIM PLA-A-BA6 Operation Manual

6. Trouble Shooting

Having trouble?
Air conditioner does not heat or cool well.
When heating operation starts, warm air does not blow from the indoor
unit soon.
During heating mode, the air conditioner stops before the set room tem-
perature is reached.
Air ow direction changes during operation or air ow direction cannot be
set.
When the airflow direction is changed, the vanes always move up and
down past the set position before nally stopping at the position.
A owing water sound or occasional hissing sound is heard.
A cracking or creaking sound is heard.
The room has an unpleasant odor.
A white mist or vapor is emitted from the indoor unit.
Water or vapor is emitted from the outdoor unit.
" " appears in the wired remote controller display. (*1)
When restarting the air conditioner soon after stopping it, it does not
operate even though the ON/OFF button is pressed.
Air conditioner operates without the ON/OFF button being pressed. (*1)
Air conditioner stops without the ON/OFF button being pressed. (*1)
Wired remote controller timer operation cannot be set. (*1)
"PLEASE WAIT" appears in the wired remote controller display. (*1)
An error code appears in the remote controller display.
Draining water or motor rotation sound is heard.
Here is the solution. (Unit is operating normally.)
Clean the lter. (Air ow is reduced when the lter is dirty or clogged.)
Check the temperature adjustment and adjust the set temperature.
Make sure that there is plenty of space around the outdoor unit. Is the
indoor unit air intake or outlet blocked?
Has a door or window been left open?
Warm air does not blow until the indoor unit has suf ciently warmed up.
When the outdoor temperature is low and the humidity is high, frost
may form on the outdoor unit. If this occurs, the outdoor unit performs a
defrosting operation. Normal operation should begin after approximately
10 minutes.
During cooling mode, the vanes automatically move to the horizontal
(down) position after 1 hour when the down (horizontal) air ow direction
is selected. This is to prevent water from forming and dripping from the
vanes.
During heating mode, the vanes automatically move to the horizontal
air ow direction when the air ow temperature is low or during defrosting
mode.
When the air ow direction is changed, the vanes move to the set
position after detecting the base position.
These sounds can be heard when refrigerant is owing in the air
conditioner or when the refrigerant ow is changing.
These sounds can be heard when parts rub against each due to
expansion and contraction from temperature changes.
The indoor unit draws in air that contains gases produced from the
walls, carpeting, and furniture as well as odors trapped in clothing, and
then blows this air back into the room.
If the indoor temperature and the humidity are high, this condition may
occur when operation starts.
During defrosting mode, cool air ow may blow down and appear like a
mist.
During cooling mode, water may form and drip from the cool pipes and
joints.
During heating mode, water may form and drip from the heat exchanger.
During defrosting mode, water on the heat exchanger evaporates and
water vapor may be emitted.
During central control, " " appears in the wired remote controller
display and air conditioner operation cannot be started or stopped using
the wired remote controller.
Wait approximately three minutes. (Operation has stopped to protect
the air conditioner.)
Is the on timer set?
Press the ON/OFF button to stop operation.
Is the air conditioner connected to a central wired remote controller?
Consult the concerned people who control the air conditioner.
Does " " appear in the wired remote controller display?
Consult the concerned people who control the air conditioner.
Has the auto recovery feature from power failures been set?
Press the ON/OFF button to stop operation.
Is the off timer set?
Press the ON/OFF button to restart operation.
Is the air conditioner connected to a central wired remote controller?
Consult the concerned people who control the air conditioner.
Does " " appear in the wired remote controller display?
Consult the concerned people who control the air conditioner.
Are timer settings invalid?
If the timer can be set, or appears in the wired remote controller
display.
The initial settings are being performed. Wait approximately 3 minutes.
The protection devices have operated to protect the air conditioner.
Do not attempt to repair this equipment by yourself.
Turn off the power switch immediately and consult your dealer. Be
sure to provide the dealer with the model name and information that
appeared in the remote controller display.
When cooling operation stops, the drain pump operates and then stops.
Wait approximately 3 minutes.
7