23
AH-X079E/X099E
AY-X079E/X099E
BREAK
DOWN
DIAGNOSIS
PROCEDURE
Self-diagnostic
procedure
using
display
mode
If
the
timer
lamp
blinks
during
operation,
the
problem
can
be
diagnosed
using
the
following
table.
: 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
Compressor lock error
DC overcurrent error
AC overcurrent error
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. 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. Outdoor control board.
1. Measure the resistance of thermistor TH2 on the outdoor unit
(see Figure 2).
1. Replace power transistor
module
1. Clear the discharge outlet.
11 times
Power factor module error
1. CHeck wiring of power factor module.
1. Replace the power factor module.
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. Replace the 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 and TH2 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
N
o
te
:
1
.
N
o
rm
a
l
:
O
n
ly
t
h
e
t
im
e
r
la
m
p
b
lin
k
s
.
E
rr
o
r
:
D
is
p
la
y
e
d
b
y
b
lin
k
in
g
o
f
ru
n
l
a
m
p
(
a
b
o
v
e
t
a
b
le
).
2
.
If th
e power
plug is r
e
m
o
v
e
d
f
ro
m
t
h
e
o
u
tl
et
o
r t
he br
eak
e
r i
s
sw
itc
he
d t
o "O
F
F
", the
s
elf-
dia
gn
os
ti
c
me
mory will
be erased
.
3
.
E
x
a
m
p
le
o
f
o
u
td
o
o
r
u
n
it
L
E
D
1
b
lin
k
in
g
:
