Operating Tips; Operation And Performance; Auto Restart - Fujitsu AST20AG Operating Manual

TROUBLESHOOTING
Instructions relating to heating (*) are applicable only to "HEAT & COOL MODEL" (Reverse Cycle).
CHECK ONCE Doesn't operate at all:
MORE
Poor Cooling
(or *Heating)
performance:
The unit operates
differently from the
remote control unit's
setting:
If the problem persists after performing these checks, or if you notice burning smells, or the TIMER indicator lamp flashes,
immediately stop operation, disconnect the power supply plug, and consult authorized service personnel.

OPERATING TIPS

Operation and Performance

*Heating Performance
● This air conditioner operates on the heat-pump principle,
absorbing heat from outdoor air and transferring that heat
indoors. As a result, the operating performance is reduced
as outdoor air temperature drops. If you feel that insuffi-
cient heating performance is being produced, we recom-
mend you use this air conditioner in conjunction with
another kind of heating appliance.
● Heat-pump air conditioners heat your entire room by
recirculating air throughout the room, with the result that
some time may be required after first starting the air con-
ditioner until the room is heated.

AUTO Restart

In Event of Power Interruption
● The air conditioner power has been interrupted by a
power failure. The air conditioner will then restart auto-
matically in its previous mode when the power is restored.
● If a power failure occurs during TIMER operation, the timer
will be reset and the unit will begin (or stop) operation at
the new time setting. In the event that this (kind of timer
fault occurs the TIMER indicator lamp (green) will flash
(see Page. 5) ).
16
Symptom
● Is the power supply plug disconnected from its outlet?
● Has there been a power failure?
● Has a fuse blown out, or a circuit breaker been tripped?
● Is the timer operating?
● Is the air filter dirty?
● Air the air conditioner's intake grille or outlet port blocked?
● Did you adjust the room temperature settings (thermostat) cor-
rectly?
● Is there a window or door open?
● In the case of Cooling operation, is a window allowing bright sun-
light to enter? (Close the curtains.)
● In the case of Cooling operation, are there heating apparatus and
computers inside the room, or are there too many people in the
room?
● Are the remote control unit's batteries dead?
● Are the remote control unit's batteries loaded properly?
Items to check
*Microcomputer-controlled Automatic Defrosting
● When using the Heating mode under conditions of low
outdoor air temperature high humidity, frost may form
on the outdoor unit, resulting in reduced operating per-
formance.
In order to prevent this kind of reduced performance, this
unit is equipped with a Microcomputer-controlled Auto-
matic Defrosting function. If frost forms, the air condi-
tioner will temporarily stop, and the defrosting circuit will
operate briefly (for about 7 to 15 minutes).
During Automatic Defrosting operation, the OPERATION
indicator lamp (red) will flash.
● Use of other electrical appliances (electric shaver, etc.) or
nearby use of a wireless radio transmitter may cause the
air conditioner to malfunction. In this event, temporarily
disconnect the power supply plug, reconnect it, and then
use the remote control unit to resume operation.
See Page
—
9 to 10
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6