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AH-X07SE/X095E
AH-XO7SE/X09SE
AU-X07SE/X095E
AU-X075E/X095E
AY-XO7S5E/X095E
AY-X075E/X095E
AE-X075E/X09SE
AE-X07SE/X095E
BREAK DOWN
DIAGNOSIS PROCEDURE
Self-diagnostic procedure using dispiay mode
If the timer larnp blinks during operation, the problem can be diagnosed using the following table.
To run a diagnosis, stop operamove controller and then hold down the "AUX" button for at least 5 sec.
@ : Blinks at2-secondintevals
>
:OFF
©)
:ON
©:Blinks 3 times at 0.2-second intervals
1. Apply an external shock to the
compressor.
2. Replace the compressor.
Overheat of the compressor | 1. Is the discharge outlet of the outdoor unit clogged ?
1. Clear the discharge outlet.
error
2. Is the power supply voltage at least 198 V at full power operation ?
2. Assure power supply voltage.
(protector operating) or
3. Check for refrigerant leaks at the tubing connections.
3. Refill to rated amount.
outdoor compressor
4. Measure the resistance of compressor thermistor TH1 on the
4. Replace the outdoor thermistor
thermistor TH1 short
outdoor unit (see Figure 2).
assembly.
5. Measure the resistance of heat exchanger pipe thermistor TH2 on the
|5. Replace the indoor control board
indoor unit (see Figure 1).
assembly or only TH2.
O
PAs <oanee
3times
| DC overcurrent error
1. Check the circuit in the Power transistor module:
1. Replace power transistor module
2. Is the outdoor fan revolving ?
Beka
4times
| Short circuit of the thermistor | 1. Measure the resistance of thermistor TH2 on the outdoor unit
1. Replace the outdoor thermistor
error
(see Figure 2).
assembly.
©
5times
| Open circuit of the thermistor | 1. Are the connectors of the outdoor unit thermistors well attached ?
1. Reattach.
error
2. Measure the resistance of thermistors TH1 and TH2 on the outdoor
2. Replace the outdoor thermistor
unit (see Figure 2).
assembly.
©
6times
| AC abnormal current error
1. Can voltage be detected at the current transformer on the outdoor unit | 1. Replace the outdoor contro! board
control board?
assembly.
(Current transformer wire break.)
1. Is the discharge outlet of the outdoor unit clogged ?
1. Clear the discharge outlet.
1. Replace the indoor control board
indoor unit (see Figure 1).
assembly or only TH2.
2. Does the four-way valve relay operate properly ?
2. Replace the outdoor control board
3. Does the four-way valve operate properly 7
assembly.
3. Replace the four-way valve.
=
5
s
3S
re)
3
a
S
3
&
completely
stopped
Indoor fan out of order
dé le the fan motor locked ?
1. Reones fan motor
2. Is the wiring connector firmly fitted ?
2. Reattach.
3. Is the speed signal applied to the motor ?
3. Repiace the inddor control board
:
assembl
CO
[Serial shor
7. Check the wirng between uni.
[© _____|Serial
open
| 1. Check the wiring between units.
Outdoor power supply does't | 1. Check the wiring between units.
1. Rewire.
turn on.
2. Check the fuse in the outdoor unit.
2. Replace the fuse, replace the
Wiring mistake.
3. Indoor control board.
outdoor board assembly.
4. Outdoor control board.
3. Replace the board
4. Replace the board
completely
stopped
operating
Outdoor
unit
indoor
unit
Note:
1. Hold down the "AUX" button for 5 sec. when operation is stopped to read the self-diagnostic memory.
Normal : Only the timer lamp blinks. Error : Displayed by blinking of run lamp (above table).
2. If the power plug is removed from the outlet or the breaker is switched to "OFF", the self-diagnostic memory will be erased.
3. Example of outdoor unit LED 1 blinking :
1 time
6
06,141,1,1
-
=
-
ON
Isec..| sec | sec. |sec. |sec.|sec. | sec. | sec. | sec. | sec.
Cautions when attaching or removing the board
Compressor lock
-F
.
.
:
R
ei
(sde!l edes|
ay
\eatesl'swe:
sets
Pedal ee (aks lads! lee
¢Use radio pliers to remove and insert the choke coil. Be careful
ON
sec.
|sec.!
sec.
|sec.!
sec.
| sec.|Ssec./sec.|
Sec.
:sec.!
SEC.
| SEC.
|Sec.
|Sec.
not
to cut your
hand
on
the
shield.
Overheat of the compressor = OFF
a
*When operating only the outdoor unit (cooling 40 Hz fixed mode)
2 times
To make only the outdoor unit run in cooling mode, short the
Figure 1
Temperature properties of indoor thermistors
Room temperature
Heat exchange
Figure 2
Temperature properties
of outdoor thermistors
TH2 heat exchange thenmistor
places marked with arrows below with an adaptor, 'and apply a
Ka
thermistor TH1
thermistor TH2
a
voltage of 220 - 240 V AC to 1 and N on the terminal board.
Ss
(Avoid operating the outdoor unit alone for long periods of time.)
100 +
Thermistor
| Signal | Color
3
Room temperature | CN4 | Yellow
TH1 compressor thermistor
a
ie
Adaptor
Ad
80 +
@ 20K.
5
laptor
Heat exchange
TH2-1 | Orange
foo
s
(R34)
TH2-2
cCN4
= 500K
=
To measure the resistance, first remove
fo]
10K:
Ee
g
60
the soldering as shown at right.
rack
8
4
Heat exchange thermistor
-
g
ey
5
&
TH2 (orange)
2 300K
-20
0
20
a0. 60
Tester
i
ey
404
25°C resistance 15 KN
é
& 200K
——
Temperature (°C)
Microcomputer | Input
(GND)
Room temperature
~
terminal
signal
thermistor TH1 (yellow)
Tester
Tester
| 100K
Themnistor
No. | Connector | Color
| To measure the
[ Pin no. 59 _|
204
25°C resistance 10 KQ
Compressor
resistance, first
Pin no. 58
0.
thermistor
TH1|
No. 1to2 | Black | remove the
-
20 0 20
60 80 100 120
connect) tren Ue
Ov
Low input
O
il bean
p e
ee
oe
ontrol
boar
Lae
renee)
[ESSERE
ve ves [me
LU
f_High pth Ouenr onto or —>
"10
io)
31
32
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