Troubleshooting - Fujitsu Halcyon AUU18RGLX Operating Manual

Notices
* • During use of the Heating mode, the outdoor unit will
occasionally commence the defrost operation for brief
periods. During the defrosting operation, if the user sets
the indoor unit for heating again, the defrosting mode
will continue, and the Heating operation will begin after
completion of defrosting, with the result that some time
may be required before warm air is emitted.
*
• During use of the Heating mode, the top of the indoor
unit may become warm, but this is due to the fact that
coolant is circulated through the indoor unit even when it
is stopped; it is not a malfunction.

TROUBLESHOOTING

Instructions relating to heating (*) are applicable only to
Heating and Cooling model (Reverse Cycle).
In the following events, immediately stop opera-
tion 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 sup-
ply, 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.
Before requesting service, perform the following checks:
NORMAL FUNCTION
Does not operate immediately
• 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 electrical breaker is turned off then on
again, the protection circuit will operate for about 3 min-
utes, preventing unit operation during that period.
Noise is heard
• 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 con-
traction of the front cover due to temperature changes.
* • During Heating operation, a sizzling sound may be heard
occasionally. This sound is produced by the Automatic
defrosting operation.
Smells
• 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.
En-5
WARNING
Mist or steam are emitted
• 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.
Humidity does not drop
In the case of Dry operation.
• In some conditions of the room, the humidity does not
drop.
• In order to lower the humidity, set a lower room tempera-
ture.
Airfl ow is weak or stops
• Indoor unit fan may start later than the outdoor unit fan,
or it may stop when the outdoor unit fan is not operating.
This is due to the Indoor unit fan control for energy sav-
ing operation.
• To disable this function, refer to the operation manual of
the remote controller. (This function cannot be disabled
in Auto fan mode.)
* • When Heating operation is started, fan speed is tempo-
rarily 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
operation (maximum of 15 minutes) as the Automatic
defrosting mode operates. During the Automatic defrost-
ing operation, the defrost mode will be indicated.
<<See operating manual of Remote controller.>>
• The fan may operate at very low speed during Dry op-
eration or when the unit is monitoring the room's tem-
perature.
• During Quiet operation, the fan will operate at very low
speed.
• In the monitor Auto operation, the fan will operate at very
low speed.
The fl ow direction does not change according to the
setting or does not change at all
• Even if the fl ow direction is set, it may operate temporar-
ily at a different position at the start of heating opera-
tion, during defrost, or when AUTO (auto changeover) is
selected.
Water is produced from the outdoor unit
* • During Heating operation, water may be produced from
the outdoor unit due to the Automatic defrosting opera-
tion.