Sharp AE-XM24CR (serv.man17) Service Manual ▷ View online
45
AY-XM7/9/12CR
AY-XPM7/9/12CR
AE-XM18/24CR
AY-XPM7/9/12CR
AE-XM18/24CR
Indoor unit
operating
Outdoor unit
completely stopped
Serial short
Serial open
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. Outdoor control 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 rotation pulse signal applied to the motor ?
1. Rewire.
2.Replace the fuse, replace the
outdoor board assembly.
3. Replace the board.
1. Replace fan motor
2. Reattach.
3.Replace the indoor control
board assembly.
: Blinks at 1-second intervals
: OFF
: ON
: Blinks 3 times at 0.1-second intervals
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
51 ~ 52
Diagnosis
Solution
Condition
of indoor
and
outdoor
unit
46
AY-XM7/9/12CR
AY-XPM7/9/12CR
AE-XM18/24CR
AY-XPM7/9/12CR
AE-XM18/24CR
100
80
60
40
20
0
-10
0
1
0
2
0
3
0
4
0
Resistance
Thermistor
Room temperature
Heat exchange
Pipe temperature
Color
Yellow
Orange
Black
Room temperature
thermistor TH1 (CN6 3 - 4 )
Heat exchange
thermistor TH2 (CN6 1 - 2 )
Pipe temperature
thermistor TH3 (CN6 5 - 6 )
Tester
CN6
1
6
Signal
TH1
TH2
TH3
Figure 1 Temperature properties of indoor thermistors
kΩ
500k
400k
300k
200k
100k
0
-20
0
2
0
6
0
8
0
100
120
3.06k
5.78k
2.28k
1.72k
40k
30k
20k
10k
0
-20
0
2
0
6
0
40
Figure 2 Temperature properties of outdoor thermistors
Connector
CN8B
1
6
TH1 compressor thermistor
(CN8A 1 - 2 )
TH2 - TH7
Temperature (
°C)
Temperature (
°C)
Thermistor
Color
No.
Connector
Compressor thermistor
Heat exchanger pipe thermistor
Connector pin
Outdoor temp. thermistor
TH1
TH2
TH3
CN8A
CN8A
Red
No. 1 to 2
No. 3 to 4
No. 5 to 6
No. 7 to 8
No. 1 to 2
No. 3 to 4
No. 5 to 6
Orange
Suction thermistor
TH4
CN8A
Black
Thermistor unit A (suction)
TH5
CN8B
Blue
Thermistor unit B (suction)
TH6
CN8B
White
Thermistor unit C (suction)
TH7
CN8B
Brown
CN8A
Green
Connector
CN8A
18
25
°C resistance
45 k
Ω
Resistance (
Ω)
Resistance (
Ω)
0°
C resistance
14.5 k
Ω
25
°C resistance
4.431 k
Ω
Cautions when attaching or removing the board
When oper
ating only the outdoor unit (cooling 55 Hz fix
ed mode)
T
o
mak
e
only the outdoor unit r
un in cooling mode
, and apply a v
oltage of 230
V A
C
to 1 and N on the ter
minal board and push the pump do
wn s
witch.
(SW51)
(A
v
oid oper
ating the outdoor unit alone f
or long per
iods of time
.)
To measure the resistance, first remove
the soldering as shown at right.
Room temperature
thermistor TH1 (Yellow)
25
°C resistance 10 k
Ω
Heat exchange thermistor
TH2 (Orange), TH3 (Black)
25
°C resistance 4.431 k
Ω
To measure the resistance, first remove the connector from the board.
4.17k
TH2 : Heat exchanger pipe thermistor (CN8A 3 - 4 )
TH3 : Outdoor temp. thermistor (CN8A 5 - 6 )
TH4 : Suction thermistor (CN8A 7 - 8 )
TH5 : Thermistor unit A (CN8B 1 - 2 )
TH6 : Thermistor unit B (CN8B 3 - 4 )
TH7 : Thermistor unit C (CN8B 5 - 6 )
47
AY-XM7/9/12CR
AY-XPM7/9/12CR
AE-XM18/24CR
AY-XPM7/9/12CR
AE-XM18/24CR
TROUBLESHOOTING OF CONTROL CIRCUIT
1
Yes
Yes
Yes
No
No
No
No
How to distinguish the defective parts
When all rooms are not cooled
Are the timer lamps of the in-
door units in all rooms flashing ?
Is the compressor of the outdoor
unit operating ?
Are the timer lamps of the indoor
units in all rooms flashing ?
Check the failure symptom with
the failure diagnosis mode.
The cooling cycle is abnormal.
Check the pressure.
Check that the power between
the terminal board " N " and " 1 "
of the indoor unit is AC 230V,
50Hz.
Repair the wiring between the
units.
Press the OPERATION button
to start operating the air-condi-
tioner. (One-room operation ON)
(Set the cooling mode to 18˚C.)
(Check the failure with the outdoor unit.)
TO
A
48
AY-XM7/9/12CR
AY-XPM7/9/12CR
AE-XM18/24CR
AY-XPM7/9/12CR
AE-XM18/24CR
Yes
No
Yes
Yes
Yes
Yes
No
No
No
Yes
No
No
No
No
(Lamp : OFF)
(Lamp : ON)
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Open circuit of the
outdoor thermistor
Replace the
thermistor.
Replace the
Fan motor.
Replace the outdoor control PWB.
Replace the
Compressor.
Replace the
Power module.
Fix the power
module with
screws securely.
Replace the
current
transformer
Connect CN15.
Connect CN6.
Overheat of the
compressor
Is CN9 connected ?
Is CN9B connected ?
Is CN1 connected ?
Is CN7 connected ?
Is CN16 connected ?
Is CN14 connected ?
Replace the outdoor
Power supply P.W.B.
Check the voltage
(18V) between CN14
3 and 4 ? )
Replace the Power
module
Connect CN9
Connect CN9B
Connect CN91
Connect CN7
Connect CN16
Connect CN14
Replace the
outdoor relay P.W.B.
Check the voltage
(13V) between CN9
2 and 3 ? )
Replace the Power
module
AC overcurrent
Rotation error of
the compressor
Power module
(IPM) abnormality
Abnormal
AC current
Is the winding of
the current
transformer
broken ?
Is the resistance
value of the
winding in the
current
transformer ?
720
Ω
Open circuit of
serial signal line
Short circuit of
serial signal line
Power factor
module (AF1) error
Is the Power factor
module in a state
of flaoting from the
heat sink ?
Is the resistance
value among the
terminal of the
Power factor
module 0
Ω
?
Fix the Power
factor module with
screws secuely
Replace the Power
factor module
Are two or three
lamps switched
off ?
Is CN15
connected ?
Is CN6
connected ?
Is the resistance
value of the
thermistor for
the compressor
(TH1), heat ex-
changer (TH2)
or outdoor
temperature
correct (TH3)
or suction (TH4) ?
Is the outdoor
fan motor
operating ?
Is the resistance
value of the winding
in the fan motor
∞
?
The cycle is
abnormal.
The compressor
is abnormal.
Is each of the
resistance values
among the
terminals of the
power module
0Ω
?
P - U, N - U
P - V, N - V
P - W, N - W
Is the power
module in a state
of floating from
the heat sink ?
Inspect the
compressor,
heat exchanger
and piping.
A
Replace the outdoor
Power supply P.W.B.
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