Read Sharp AE-XM24CR (serv.man11) Service Manual online
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.
49
AY-XM7/9/12CR
AY-XPM7/9/12CR
AE-XM18/24CR
AY-XPM7/9/12CR
AE-XM18/24CR
2
Yes
Yes
No
Yes
No
No
No
Yes
No
No
Yes
Yes
Short circuit of the thermistor error
Open circuit of the thermistor error
Is the resistance value of the
thermistor for UNIT A (TH5),
UNIT B (TH6) or UNIT C (TH7)
Open circuit of serial signal line
Short circuit of serial signal line
When one room is not cooled (other rooms are cooled)
Is the timer lamp of the
indoor unit in the room
not cooled flashing ?
Press the OPERATION
button to start operating
the air-conditioner.
(Set the cooling mode
to 18˚C.)
Is the timer lamp of the
indoor unit in the room
not cooled flashing ?
Check that the power
between the terminal
board "N" and "1" of the
indoor unit is AC 230V.
Repair the wiring
between the units.
Replace the indoor
control PWB.
Replace the thermistor.
Check the failure
symptom with the failure
diagnosis mode.
Replace the outdoor control
PWB
or the exppansion valve (UNIT A)
or the exppansion valve (UNIT B)
or the exppansion valve (UNIT C)
Is the resistance value of the
winding in the fan motor
∞
?
(Between 1 and 3 of CN1)
Abnormal fan motor of
indoor unit
The thermal fuse is blown.
The motor is locked.
Replace the indoor fan motor.
Is the wiring between the
units connected by mistake
or broken ?
Repair the wiring between
the units.
Replace the indoor control PWB.
50
AY-XM7/9/12CR
AY-XPM7/9/12CR
AE-XM18/24CR
AY-XPM7/9/12CR
AE-XM18/24CR
3 When all rooms are not heated
Does the air get cooler in the
cooling operation mode?
cooling operation mode?
Check the four-way valve.
Has the cycle been switched?
Has the cycle been switched?
Replace the outdoor
relay PWB.
relay PWB.
Is AC230V applied between
the connector(CN4) 1 and 3
of the 4-way valve ?
the connector(CN4) 1 and 3
of the 4-way valve ?
Replace the four-way valve.
Pressure check
The heating cycle is normal.
Refer to (1) All rooms are
not cooled.
not cooled.
Press the ON switch on the
remote control to run the air
conditioner.
Set the temperature to 32˚C
in the heating mode and
start operation.
remote control to run the air
conditioner.
Set the temperature to 32˚C
in the heating mode and
start operation.
Is the outdoor compressor
running?
running?
Yes
Yes
Yes
Yes
No
No
No