Troubleshooting; Personnel - Fujitsu Inverter Operating Manual

TROUBLESHOOTING

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 ensure that power is completely off.
Before requesting service, perform the following checks:
NORMAL Doesn't operate immedi-
FUNCTION ately:
Noise is heard:
Smells:
Mist or steam are
emitted:
Airfl ow is weak or stops:
Water is produced from the
outdoor unit:
En-16
Symptom
● 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 electrical breaker is turned off than on again or the
power supply plug is disconnected and then reconnected, the protec-
tion 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 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 air emitted from the indoor unit, resulting in condensation
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 fur-
ther, set the temperature for a higher setting.
● During Heating operation, the unit will temporarily stop operation
(for 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.
● In case of Multi-type unit, if multiple units are operated in different
operation 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.
CAUTION
Problem See Page
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