8 Troubleshooting
245
SMGB0087 rev.0 - 12/2013
8
Alarm code
19
Activation of the protection device for the indoor fan motor (RCI-FSN3, RCIM-FSN3, RPC-FSN3)
- This alarm code is displayed when the following conditions occurs three times in 30 minutes. Indoor fan rotates less
than 70 rpm for 5 seconds during operation.
• (*)When the cause is checked by means of this ow chart, conrm that fan speed setting is Hi.
Yes
(*1)
The electrical source for IU PCB1 is not supplied when
LED4 is turned OFF
Is LED4 on IU
PCB1 OFF? (*1)
Faulty IU PCB1
Check connectors
PCN7 and CN1 on IU
PCB1
Check that 230 V is
applied between L1
and N of TB1
Yes
Is LED5 on IU
PCB1 OFF? (*2)
No
Is DC power
output of IU PCB1
normal? (*3)
No
Is DC power
output of IU PCB1
normal? (*4)
Yes
Is fan motor
speed control
command to fan
motor correctly?
(*5)
Yes
No
Replace IU PCB1
Yes
Faulty IU PCB1
Yes
Faulty IU PCB1
No
Faulty IU PCB1
No
Faulty IU PCB1
Replace IU PCB1
Replace IU PCB1
Replace IU PCB1
Replace IU PCB1
(*2)
Abnormal voltage is supplied for fan motor.
(Normal voltage: DC280V)
(*3)
Measure the voltage between VCC15 and VDC
(15V±10%) by tester.
(*4)
Measure following check points voltages by tester.
Between VCC05 and GND: 5V±4%
Between VCC13 and GND: 13.1V±10%
(*5)
Perform the operation with disconnecting CN1 on IU PCB1. It is normal if more than
1V generates between number 3 pin of CN1 and VDC- (check point) for approx 10
seconds after starting the operation.
N O T E
• Even if the operation is stopped, 0.3 to 0.4V may generate.
• Since the control specied in “*” is performed after the 10th second from the
start of operation, it may not be possible to obtain a steady voltage after the 10th
second.
Replace IU PCB1
Replace fan motor
Yes
Does fan motor
run?
No
Is speed pulse
signal to IU PCB1
correctly? (*6)?
Replace fan motor
Faulty IU PCB1
(*6)
Perform the operation with connecting CN1 on PCB1. It is normal if several voltages
generate between number 2 pin of PC4 and VDC- (check point).
N O T E
Even if the operation is stopped, approx 0.2V may generate.
No
Yes
Faulty fan motor
Faulty fan motor
(*5)
(*6)
Occurrence of Alarm
code “19”
BA 1 2
SR L
LED3
LED1
RSW2
CN6
HA
CN14CN4CN3
CN9CN10
IC1
DSW5
CN11
CN34
DSW4
TP
ON
1 2 3 4
ON
1 2
DSW9
ON
1 2 3 4 5 6
DSW6
ON
1 2 3 4 5 6
0
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
ON
1 2 3 4 5 6
RSW1
DSW3
LED6
CN28
CN5 THU1
THM5 THM4CN33
LED4
CN2
L3
EF2
+
+
THM3 THM2 THM1
CN7
CN36CN8
+
+
+
REG2
L1
SW1
PCN1
TR1
LED5
DM1
T1
PCN6
PCN7
EFS1
EFR1
L5
ON
1 2
+
+
CN17
REG3
CN1
PCN4
DSW7
VCC13 VCC05 GND PC4 VCC15 CN1
LED5 VDC-
PC4-#2
RPC-FSN3
CN1
PC4- No.2 Pin
LED5 (RED)
LED4 (RED)
VCC15VCC12VCC05
GND1
0
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
21 3 4 5 6
ON
21 3 4 5 6
ON
ON
1 2
ON
1 2
ON
1 2 3 4
ON
1 2 3 4 5 6
+
+
+
+
+
+
+
+
+
+
R119
R121
R113
R110
R11
2
R123
000
000
000
+
103
103
103
103
103
NB
NB
103
203
103
PB
103
102
R80
TP
HA
CN3
R39
R36
Q32
R83
R63
Q7
RA2
RA3
CN28
R73
Q6
C93
Q35
Q36
R165
CN17
CN12
IC1
C33
R75
C71
CN27
LED4
REG3
C68 C64
C67
C72
C73
L2
REG2
DSW6
RSW1
RSW2
DSW5
ZD13
C89
D37
JP2
JP4
JP1
JP3
JP6
JP5
DSW3
DSW4
D12
LED3
LED1
L1
NB NB
Q22Q21
PC1
IC5IC6
103
R11
+
C3
102
103
R14
R7
222
222
R15
R16
NB W4
Q23 Q20
EF2
DSW7
THM1THM2
THM3
CN2
D32
D33
Z4 Z5
102
NB
HB
HB
C10
R10
Q24
ZD9ZD10
C1
C2
333
333
R5
R6
FUNC
CN9
DSW9
C14
C18 C19
103
RA1
C56
SW1
+
+
++
C28
C31
C27
C46
C26
471
R37
OSC
CN5
CN6
CN4
THU1
THM4
CN14
THM5
CN8
CN7
CN11
CN10
D43
L3
NB
NB
102104512
103
C50
PC2
SSR
Q1
Q4
R109
R102R104R106
PC3
TR1
R132
C85
D39
Z3
C60
R122
R120
EFR1
JPS1
JPR1
C55
PCN7
C54
DSA
C57
EFS1
Z2
Z1
YH2
PCN6PCN4
CN1
R108
R118
C53
C52
DM1
L5
C78
LED5
C84
REG1
C61
PC6 PC5 PC4
103
3302
R85
R86
+
C48
D34
R129
IC9
ZD4
ZD3
RCIM-FSN3
2
1
B
A
L
R
S
LED3
LED1
RSW2
CN6
HA
CN14 CN4 CN3
CN9 CN10
IC1
DSW5
CN11
CN34
DSW4
TP
ON
1 2 3 4
ON
1 2
DSW9
ON
1 2 3 4 5 6
DSW6
ON
1 2 3 4 5 6
0
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
ON
1 2 3 4 5 6
RSW1
DSW3
LED6
CN28
CN5THU1
THM5THM4 CN33
LED4
CN2
L3
EF2
+
+
THM3THM2THM1
CN7
CN36 CN8
+
+
+
REG2
L1
SW1
PCN1
TR1
LED5
DM1
T1
PCN6
PCN7
EFS1
EFR1
L5
+
+
ON
1 2
CN17
DSW7
PCN4
CN1
REG3
PC4-#2
VDC-
CN1 VCC15 GND VCC05
VCC13
LED5 PC4
RCI-FSN3
C A U T I O N
• Perform the following check after setting the air ow volume to “HIGH”.
• A high voltage is applied to electrical parts. Perform the check carefully to prevent an
electric shock.
N O T E
Turn OFF the power source securely before connector checking. If not, it may cause DC
fan motor failure. (Built-in PCB for DC fan motor may be damaged.)
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