21
AH-S22AW2
AH-S25AW2
BREAK
DO
WN
DIA
GNOSIS
PR
OCEDURE
N
o
te
:
1
.
N
o
rm
a
l
:
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n
ly
t
h
e
t
im
e
r
la
m
p
b
lin
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.
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rr
o
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:
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is
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b
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k
in
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o
f
ru
n
l
a
m
p
(
a
b
o
v
e
t
a
b
le
).
2
.
If the power plug is re
m
o
v
e
d
f
ro
m
t
h
e
o
u
tl
e
t or
th
e
b
re
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ker
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hed
t
o
"O
F
F
",
the
s
el
f-
di
agn
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ti
c
mem
ory
wi
ll be
e
rased.
3
.
E
x
a
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td
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E
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g
:
Self-diagnostic
procedure
using
display
mode
If
the
timer
lamp
blinks
during
operation,
the
problem
can
be
diagnosed
using
the
following
table.
To
run
the
diagnisis,
stop
operation
by
remote
controller,
and
then,
press
the
"AUX
."
button
for
5
seconds
and
over.
: Blinks at 2-second intervals
: OFF
: ON
: Blinks 3 times at 0.2-second intervals
Indoor and outdoor unit
completely stopped
Indoor unit
operating
Outdoor unit
completely stopped
Display by indoor unit operation lamp
Displayed in a pattern which comes on at the same
time as the timer lamp
4 seconds off
What to check, procedure
Display by
outdoor
unit lamp
LED 1
Diagnosis
Solution
Condition
of indoor
and
outdoor
unit
Normal
Once
Twice
3 times
4 times
5 times
6 times
7 times
10 times
Compressor lock error
DC overcurrent error
AC overcurrent error
Outdoor terminal board
thermal fuse operation
Normal
Serial short
Serial open
Does compressor active ? Does it go off immediately after active ?
1. Check the circuit in the power transistor module.
2. Is the outdoor fan revolving ?
1. Is the discharge outlet of the outdoor unit clogged ?
1. Does the thermal fuse operate ?
1. Check the wiring between units.
1. Check the wiring between units.
1. Check the wiring between units.
2. Check the fuse in the outdoor unit.
3. Indoor control board.
4. Does power supply to the outdoor electric control board.
1. Measure the resistance of thermistor TH2 and TH3 on the outdoor
unit(see Figure 2).
1. Replace power transistor
module
1. Clear the discharge outlet.
1. Replace the terminal board.
1. Rewire.
1. Rewire.
Indoor fan out of order
1. Is the fan motor locked ?
2. Is the wiring connector firmly fitted ?
3. Is the speed signal applied to the motor ?
Overheat of the comp-
ressor error
(protector operating) or
outdoor compressor
thermistor TH1 short
Outdoor power supply
does't turn on.
Wiring mistake.
1. Rewire.
2.
Replace the fuse, replace the
outdoor board assembly.
3. Replace the board.
4. The following parts may be
detective.
Capacitor, Diode bridge, Outdoor
control board.
1. Replace fan motor
2. Reattach.
3.
Replace the indoor control board
assembly.
1.
Replace the outdoor control board
assembly
(Current transformer wire break.)
1. Reattach.
2.
Replace the outdoor thermistor
assembly.
1.
Replace the outdoor thermistor
assembly.
1.
Clear the discharge outlet.
2.
Assure power supply voltage.
3.
Refill to rated amount.
4.
Replace the outdoor ther-mistor
assembly.
5.
Replace the indoor control
board
assembly or only TH2
.
1. Apply an external shock to the
compressor.
2. Replace the compressor.
1. Can voltage be detected at the current transformer on the outdoor
unit control board?
1. Are the connectors of the outdoor unit thermistors well attached ?
2. Measure the resistance of thermistors TH1,TH2 and TYH3 on the
outdoor unit (see Figure 2).
1. Is the discharge outlet of the outdoor unit clogged ?
2. Is the power supply voltage at least 198 V at full power operation ?
3. Check for refrigerant leaks at the tubing connections.
4. Measure the resistance of compressor thermistor TH1 on the
outdoor unit (see Figure 2).
5. Measure the resistance of heat exchanger pipe thermistor TH2 on
the indoor unit (see Figure 1).
AC abnormal current
error
Open circuit of the
thermistor error
Short circuit of the
thermistor error
