Troubleshooting - Fujitsu ASY25UI-LU Operating Manual

TROUBLESHOOTING

WARNING
Before requesting service, perform the following checks:
Symptom
NORMAL Does not operate imme-
FUNCTION diately:
Noise is heard:
Smells:
Mist or steam is emit-
ted:
Airfl ow is weak or stops:
Water is produced from
the outdoor unit:
When the fi lter sign is set, the LED lamp may fl ash. In this case, please refer to "Filter Indicator Reset (Special setting)".
In following events, immediately stop operation of the air conditioner, and disconnect all the power
supply by turning off the electrical breaker or disconnecting the power plug. Then consult your dealer
or authorized service personnel.
As long as the unit is connected to the power supply, it is not insulated from the power supply even if
the unit is turned off.
● Unit smells of something burning or emits smoke
● Water leaks from the unit
● If the indoor unit is stopped and then immediately started again, the
compressor will not operate for about 3 minutes, in order to prevent
fuse blowouts.
● Whenever the electrical breaker is turned off then on again the pro-
tection circuit will operate for about 3 minutes, preventing unit op-
eration during that period.
● During operation or 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 refrigerant fl owing).
● During operation, a slight squeaking sound may be heard. This is
the result of minute expansion and contraction of the front panel
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 indoor unit.
● 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 cool air emitted from the indoor unit, resulting in conden-
sation 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
Defrosting 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
temperature 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 temperature for a higher setting.
● During Heating operation, the indoor unit will temporarily stop op-
eration (Max. 15 minutes) as the Automatic Defrosting mode oper-
ates. During Automatic Defrosting operation, the OPERATION Indi-
cator Lamp will fl ash.
● During Dry mode, the indoor unit will operate at low speed; in order
to adjust room humidity, the indoor unit's fan may stop from time to
time. Also, the fan may operate at very low speed when adjusting
room humidity.
● During SUPER QUIET operation, the fan will operate at very low speed.
● In the monitor of AUTO operation, the fan will operate at very low
speed.
● In case of Multi-type unit, if multiple units are operated in different op-
eration modes as shown below, the units operated afterward will stop
and the OPERATION indicator lamp (green) will fl ash.
Heating mode and cooling mode (or Dry mode)
Heating mode and fan mode
● During Heating operation, water may be produced from the outdoor
unit due to Automatic Defrosting operation.
Cause See Page
—
—
21
—
—
21
—
22
7
6
7
22
21
En-20