Trouble Shooting - Mitsubishi Electric PCA-A·KA4 Operation Manual

7. Trouble Shooting

Having trouble?
Airflow direction changes during operation or airflow direction cannot be
set.
When the airflow direction is changed, the vanes always move up and
down past the set position before finally stopping at the position.
A flowing 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.
The operation indicator does not appear in the wired remote controller
display. (*1)
" " appears in the wired remote controller display. (*1)
When restarting the air conditioner soon after stopping it, it does not op-
erate 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.
Noise is louder than specifications.
Nothing appears in the IR wireless remote controller display, the display
is faint, or signals are not received by the indoor unit unless the IR wire-
less remote controller is close. (*2)
The operation lamp near the receiver for the IR wireless remote control-
ler on the indoor unit is blinking. (*2)
6
Here is the solution. (Unit is operating normally.)
During cooling mode, the vanes automatically move to the horizontal
(down) position after 1 hour when the down (horizontal) airflow direc-
tion is selected. This is to prevent water from forming and dripping
from the vanes.
During heating mode, the vanes automatically move to the horizontal
airflow direction when the airflow temperature is low or during defrost-
ing mode.
When the airflow direction is changed, the vanes move to the set po-
sition after detecting the base position.
These sounds can be heard when refrigerant is flowing in the air con-
ditioner or when the refrigerant flow is changing.
These sounds can be heard when parts rub against each due to ex-
pansion 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 airflow 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 ex-
changer.
During defrosting mode, water on the heat exchanger evaporates and
water vapor may be emitted.
Turn on the power switch. " " will appear in the wired remote controller
display.
During central control, " " appears in the wired remote controller
display and air conditioner operation cannot be started or stopped us-
ing 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,
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.
The indoor operation sound level is affected by the acoustics of the
particular room as shown in the following table and will be higher than
the noise specification, which was measured in an echo-free room.
High sound-
absorbing rooms Normal rooms
Broadcasting
Location
studio, music
examples
room, etc.
Noise levels 3 to 7 dB
The batteries are low.
Replace the batteries and press the Reset button.
If nothing appears even after the batteries are replaced, make sure
that the batteries are installed in the correct directions (+, –).
The self diagnosis function has 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.
, , or appears in
Low sound-ab-
sorbing rooms
Reception
Office, hotel
room, hotel
room
lobby, etc.
6 to 10 dB 9 to 13 dB