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Troubleshooting - Fujitsu Inverter Halcyon 9374379392-04 Operating Manual

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Instructions relating to heating (*) are applicable only to "HEAT & COOL MODEL" (Reverse Cycle).
Before requesting service, perform the following checks:
Doesn't operate immedi-
Noise is heard:
Mist or steam are
Airfl ow is weak or stops:
Water is produced from
the outdoor unit:
The ECONOMY Indicator fl ashes
thermo sensor display
on the remote controller
is fl ashing:
In the event of a malfunction (burning smell, etc.), immediately stop operation, turn off the electrical
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 the electrical breaker to ensure 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 electrical breaker is turned off then on again, 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 panel
due to temperature changes.
*● During Heating operation, a sizzling sound may be heard occasion-
ally. 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 emit-
ted from the indoor unit. This results from the sudden Cooling of
room air by the air emitted from the indoor unit, resulting in con-
densation 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 the Auto-
matic 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 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 to a higher setting.
*● During Heating operation, the unit will temporarily stop opera-
tion (between 4 and 15 minutes) as the Automatic Defrosting
mode operates. During the Automatic Defrosting operation,
will be shown on the remote controller display.
● The fan may operate at very low speed during Dry operation or
when the unit is monitoring the room's temperature.
● During QUIET operation, the fan will operate at ver y low
● In the monitor AUTO operation, the fan will operate at very low
● In case of Multi-type unit, if multiple units are operated in differ-
ent operation modes as shown below, the units operated after-
ward 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 out-
door unit due to the Automatic Defrosting operation.
● Clean the fi lter. Afterwards, turn the ECONOMY Indicator off.
● The room temperature sensor may be malfunctioning. Please con-
sult authorized service personnel.
will be shown on the remote controller display.


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