Mitsubishi Electric SLZ-KF50VA / SUZ-KA50VA5 [11/28] Trouble shooting
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Mitsubishi Electric SLZ-KF50VA / SUZ-KA50VA5 [11/28] Trouble shooting

Mitsubishi Electric SLZ-KF35VA / SUZ-KA35VA5 [11/28] Trouble shooting
11
6. Trouble Shooting
Having trouble? Here is the solution. (Unit is operating normally.)
Air conditioner does not heat or cool well.
■ Clean the fi lter. (Airfl ow is reduced when the fi 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?
When heating operation starts, warm air does not blow from the indoor
unit soon.
■ Warm air does not blow until the indoor unit has suffi ciently warmed
up.
During heating mode, the air conditioner stops before the set room tem-
perature is reached.
■ 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.
Airfl ow direction changes during operation or airfl ow direction cannot be
set.
■ During cooling mode, the vanes automatically move to the horizontal
(down) position after 1 hour when the down (horizontal) airfl 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
airfl ow direction when the airfl ow temperature is low or during defrosting
mode.
When the airfl ow direction is changed, the vanes always move up and down
past the set position before fi nally stopping at the position.
■ When the airfl ow direction is changed, the vanes move to the set position
after detecting the base position.
A fl owing water sound or occasional hissing sound is heard.
■ These sounds can be heard when refrigerant is fl owing in the air condi-
tioner or when the refrigerant fl ow is changing.
A cracking or creaking sound is heard.
■ These sounds can be heard when parts rub against each due to expan-
sion and contraction from temperature changes.
The room has an unpleasant odor.
■ 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.
A white mist or vapor is emitted from the indoor unit.
■ If the indoor temperature and the humidity are high, this condition may
occur when operation starts.
■ During defrosting mode, cool airfl ow may blow down and appear like a
mist.
Water or vapor is emitted from the outdoor unit.
■ 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 exchang-
er.
■ During defrosting mode, water on the heat exchanger evaporates and
water vapor may be emitted.
“
” appears in the remote controller display.
■ During central control, “
” appears in the remote controller display and
air conditioner operation cannot be started or stopped using the remote
controller.
When restarting the air conditioner soon after stopping it, it does not oper-
ate even though the ON/OFF button is pressed.
■ Wait approximately three minutes.
(Operation has stopped to protect the air conditioner.)
Air conditioner operates without the ON/OFF button being pressed.
■ Is the on timer set?
Press the ON/OFF button to stop operation.
■ Is the air conditioner connected to a central remote controller?
Consult the concerned people who control the air conditioner.
■ Does “
” appear in the 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.
Air conditioner stops without the ON/OFF button being pressed.
■ Is the off timer set?
Press the ON/OFF button to restart operation.
■ Is the air conditioner connected to a central remote controller?
Consult the concerned people who control the air conditioner.
■ Does “
” appear in the remote controller display?
Consult the concerned people who control the air conditioner.
Remote controller timer operation cannot be set.
■ Are timer settings invalid?
If the timer can be set,
or appears in the remote controller dis-
play.
“PLEASE WAIT” appears in the remote controller display.
■ The initial settings are being performed. Wait approximately 3 min-
utes.
An error code appears in the remote controller display.
■ 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.
Draining water or motor rotation sound is heard.
■ When cooling operation stops, the drain pump operates and then stops.
Wait approximately 3 minutes.

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