Fujitsu AB12 User Manual

PCB LED
1 to 6
LCD
LED display
4. Water leaks from the indoor unit.
PCB LED
1 to 6
LCD
LED display
Remote
controller
Indoor
unit
Outdoor
unit
Remote
controller
Indoor
unit
Outdoor
unit
– 122–
Normal
display
Normal
display or
error display
(High
pressure
error)
Normal
display
System does
not cool/heat.
Ball valve opening faulty. Turn the knob of the liquid pipe,
discharge pipe, and suction pipe
ball valve counter-clockwise.
When the ball valve is fully open,
the knob of the liquid pipe and
discharge pipe is vertical and the
knob of the suction pipe is
horizontal.
Controlling
display
(Operation
display LED
flash)
Controlling
display (Oil
recovery
operation)
Normal
display
Indoor unit not
operating.
Oil recovery operation control in
progress.
All the operating indoor unit fans
are stopped and signals are not
received.
Oil recovery operation is
performed even though the
indoor unit operation state is
entered every 6 hours after the
initial hour after the outdoor unit
power is turned on.
No display or
error display
(Cannot be
specified.)
Cannot be
specified.
No display or
error display
(Cannot be
specified.)
Indoor unit fan
is not operating.
System does
not cool/heat.

Indoor control PCB faulty.
The symptom has many
branches, depending on the
error contents, and there is no
effective check method.
When the PCB or connection
wiring is faulty, operation can
often be restored by replacing
the PCB.
Cannot be
specified.
No display
or error
display
(Cannot be
specified.)
Cannot be
specified.
Indoor unit fan
is not operating.
System does
not cool/heat.

Outdoor control PCB faulty. The symptom has many
branches, depending on the
error contents, and there is no
effective check method.
When the PCB or connection
wiring is faulty, operation can
often be restored by replacing
the PCB.
Normal
display
Normal
display
Normal
display
Drain hose faulty.
Tilt the drain hose from the
indoor unit to the drain outlet.
The same symptom will also
appear when the drain hose is
clogged.
Error display
(Drain error)
Error display
(Indoor unit
error)
Error display
(Drain error)
Drain pump faulty
(Cassette type only)
During cooling operation, drain
pump is not effective even though
a voltage (DC5V) is applied
across CN5 terminals 1-2.
Generated when the float
switch does not return even
though 3 minutes have elapsed
after the operation signal was
sent from the float switch.
Float switch faulty. Remove the float switch and
move the float up and down and
check the resistance.
When the float is lowered, the
circuit is open (high resistance)
and when the float is raised, the
circuit is closed (low resistance).
Remarks
Check method
(Error state check method)
Cause
Remarks
Check method
(Error state check method)
Cause
Generated when the float
switch does not return even
though 3 minutes have elapsed
after the operation signal was
sent from the float switch.
Operation display LED repeats
3 seconds ON, 1 second OFF
cycle.
Symptom that
can occur other
than title
Symptom that
can occur other
than title
Body
LED
Body
LED

Fujitsu AB12 Specifications

General

Brand	Fujitsu
Model	AB12
Category	Air Conditioner
Language	English