Service Manual

8. Troubleshooting
218
SMGB0079 rev.0 - 01/2013
Alarm code
19
Activation of the protection device for the indoor fan motor (RCI, RCIM)
• The RUN LED ickers and “ALARM” is displayed on the remote control switch.
• The unit number, the alarm code and the unit code are alternately displayed on the set temperature section.
• The unit number and the alarm code are displayed on the display of the outdoor unit PCB1.
- 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, conrm that fan speed setting is Hi
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
Faulty I.U. PCB1
(*1)
The electrical source for I.U. PCB1
is not supplied when LED4
is turned OFF.
(*2)
Abnormal voltage is supplied
for fan motor.
Is LED4 on
I.U. PCB1 OFF?
(*1)
Is LED5 on
I.U. PCB1 OFF?
(*2)
Check connectors PCN7
and CN1 on I.U. PCB1.
Yes
Replace I.U. PCB1.
No
No
No
No
Faulty I.U. PCB1
Replace I.U. PCB1.
Is fan motor
speed control command
to fan motor correctly?
(*5)
Yes
Yes
Faulty I.U. PCB1
Faulty I.U. PCB1
Faulty I.U. PCB1
Is DC power
output of I.U. PCB1
normal? (*3)
Replace I.U. PCB1.
Replace I.U. PCB1.
Replace I.U. PCB1.
(*3)
Measure the voltage between
VCC15 and VDC (15V+10%) by tester.
Yes
Yes
No
Occurrence of
Alarm Code “19”
(*4)
Measure following check points voltages by tester.
Between VCC05 and GND: 5V+4%
Between VCC13 and GND: 13.1V+10%
(Normal Voltage: DC280V)
No
Faulty Fan Motor Replace Fan Motor
Yes
Faulty I.U. PCB1
Faulty Fan Motor
Is speed pulse
signal to I.U. PCB1
correctly? (*6)
Replace I.U. PCB1.
Replace Fan Motor.
No
Does Fan
Motor run?
Yes
(*5)
(*6)
(*6) Perform the operation with connecting CN1 on PCB1.
It is normal if several voltages generate between
No.2 pin of PC4 and VDC- (check point).
(NOTE)
Even if the operation is stopped, approx. 0.2V may generate.
Yes
Check that 220/240V is
applied between
L1 and N of TB1.
NOTE:
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.)
(*5) Perform the operation with disconnecting CN1 on I.U. PCB1.
It is normal if more than 1V generates between No.3 pin of CN1
and VDC- (check point) for approx. 10 seconds after starting
the operation.
(NOTES)
1. Even if the operation is stopped, 0.3 to 0.4V may generate.
2. The voltage may not generate sequentially after 10 seconds
from starting the operation to perform the operation “”.
Is DC power
output of I.U. PCB1
normal? (*4)
 Perform the following check after setting
the air flow volume to “HIGH”.
A high voltage is applied to electrical parts.
Perform the check carefully to prevent
an electric shock.