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Troubleshooting - Fujitsu Inverter 9374379446 Operating Manual

Floor/ceiling type
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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 imme-
Noise is heard:
Mist or steam are
Airfl ow is weak or stops:
Water is produced from the
outdoor unit:
The ECONOMY Indicator
Lamp fl ashing.
In the event of a malfunction (burning smell, etc.), immediately stop operation, disconnect the power
supply plug or turn off the circuit 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 disconnect the power supply plug or turn off your circuit breaker to ensure
that power is completely off.
● If the 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 power supply plug is disconnected and then
reconnected to a power outlet, the protection circuit will oper-
ate for about 3 minutes, preventing unit operation during that
● 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 ow-
● 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 oc-
casionally. This sound is produced by the Automatic Defrost-
ing 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 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 the
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 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 op-
eration (Max. 15 minutes) as the Automatic Defrosting mode
operates. During the Automatic Defrosting operation, the OP-
ERATION 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 dif-
ferent 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 the Automatic Defrosting operation.
● Clean the fi lter. Afterwards, turn the ECONOMY lamp off.
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Floor/ceiling type