Fujitsu AOY30QMAM4 Operating Manual page 15

TROUBLESHOOTING
WARNING!
Before requesting service, perform the following checks:
Symptom
NORMAL Doesn't operate immedi-
FUNCTION ately:
Noise is heard:
Smells:
Mist or steam are
emitted:
Airflow is weak or stops:
Water is produced from
the outdoor unit:
The indoor unit is warm
when stopped (heating
mode):
In the event of a malfunction (burning smell, etc.), immediately stop operation, turn off the cir-
cuit breaker, and consult authorized service personnel.
Merely turning off the unit's power switch will not completely disconnect the unit from the power
source. Always be sure to turn off your circuit breaker to ensure that power is completely off.
G If the unit is stopped and then immediately started again, the com-
pressor will not operate for about 3 minutes, in order to prevent
fuse blowouts.
G Whenever the power supply plug is disconnected and then recon-
nected to a power outlet, the protection circuit will operate for about
3 minutes, preventing unit operation during that period.
G During operation and immediately after stopping the unit, the
sound of water flowing in the air conditioner's piping may be
heard. Also, noise may be particularly noticeable for about 2 to 3
minutes after starting operation (sound of coolant flowing).
G During operation, a slight squeaking sound may be heard. This is
the result of minute expansion and contraction of the front cover
due to temperature changes.
G During Heating operation, a sizzling sound may be heard occa-
sional. This sound is produced by the Automatic Defrosting op-
eration.
G Some smell may be emitted from the indoor unit. This smell is
the result of room smells (furniture, tobacco, etc.) which have
been taken into the air conditioner.
G During Cooling or Dry operation, a thin mist may be seen emitted
from the indoor unit. This results from the sudden Cooling of
room air by the air emitted from the air conditioner, resulting in
condensation and misting.
G During Heating operation, the outdoor unit's fan may stop, and
steam may be seen rising from the unit. This is due to Automatic
Defrosting operation.
G When Heating operation is started, fan speed is temporarily very
low, to allow internal parts to warm up.
G During Heating operation, if the room temperature rises above
the thermostat setting, the outdoor unit will stop, and the indoor
unit will operate at very low fan speed. If you wish to warm the
room further, set the thermostat for a higher setting.
G During Heating operation, the unit will temporarily stop opera-
tion (between 7 and 15 minutes) as the Automatic Defrosting mode
operates. During Automatic Defrosting operation, the OPERATION
indicator lamp will flash.
G The fan may operate at very low speed during Dry operation or
when the unit is monitoring the room's temperature.
G During SUPER QUIET operation, the fan will operate at very low speed.
G In the monitor AUTO operation, the fan will operate at very low speed.
G During Heating operation, water may be produced from the out-
door unit due to Automatic Defrosting operation.
G When the indoor unit is operating in the heating mode, a small
amount of the refrigerant is allowed to flow to the indoor unit in
order to prevent too much of the refrigerant from accumulating
in the outdoor unit. This causes the indoor unit to become warm
when stopped. This condition is normal.
Problem See Page
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