Troubleshooting - Fujitsu Inverter Halcyon ASU18RLXS Operating Manual

TROUBLESHOOTING

WARNING!
Before requesting service, perform the following checks:
Symptom
NORMAL Doesn't operate immedi-
ately:
FUNCTION
Noise is heard:
Smells:
Mist or steam are
emitted:
Airfl ow is weak or stops:
Water is produced from the
outdoor unit:
En-15
In the event of a malfunction (burning smell, etc.), immediately stop operation, turn off the electrical
breaker or disconnect the power supply plug, 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 the electrical breaker or disconnect the power supply plug to en-
sure that power is completely off.
● 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.
● 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.
● During operation and immediately after stopping the unit, the sound
of water fl owing 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 fl owing).
● 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.
● During Heating operation, a sizzling sound may be heard occasional.
This sound is produced by the Automatic Defrosting operation.
● 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.
● 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 condensa-
tion and misting.
● During Heating operation, the outdoor unit's fan may stop, and
steam may be seen rising from the unit. This is due to Automatic De-
frosting operation.
● When Heating operation is started, fan speed is temporarily very
low, to allow internal parts to warm up.
● 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.
● During Heating operation, the unit will temporarily stop operation
(Max. 15 minutes) as the Automatic Defrosting mode operates.
During Automatic Defrosting operation, the OPERATION Indicator
Lamp will fl ash.
● The fan may operate at very low speed during Dry operation or
when the unit is monitoring the room's temperature.
● During SUPER QUIET operation, the fan will operate at very low
speed.
● In the monitor AUTO operation, the fan will operate at very low
speed.
● During Heating operation, water may be produced from the outdoor
unit due to Automatic Defrosting operation.
Problem See Page
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