Hitachi RPI-0.8FSG1 Service Manual page 58

TROUBLESHOOTING
Alarm
Code
G "RUN" light flickers and "ALARM" is indicated on the remote control switch.
G The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the alarm code is indicated on the display of the outdoor unit PCB.
# This alarm code is indicated when the following conditions occurs three times in 30 minutes.
* Indoor fan rotates less than 70rpm for 5 seconds during operation.
Does the indoor
fan run?
Check the connector
as shown on the right.
Is LED1 on
PCB2 OFF?
Is DC power
supply for PCB2
correctly?
Is LED4 on PCB2
OFF?
Is DC power
supply for PCB1
correctly?
Is fan motor
speed control command
to fan motor
correctly?
Is pulse signal to
PCB2 correctly?
Faulty PCB1
Replace PCB1
1-48
Activation of Protection Device for Indoor Fan Motor
No
PCB1: CN1, CN19, PCN1, PCN7
PCB2: CN201, CN202, PCN201, PCN202, PCN203
Yes
Faulty PCB2
No
No
Faulty PCB2
Yes
Yes
Faulty PCB1
or Transformer
No
No
Faulty PCB1
or Transformer
Yes
Yes
Faulty
Fan Motor
No
Yes
Faulty PCB2
No
(RCI-Model)
Insufficient voltage for PCB2.
(DC 280V)
Is the voltage between Vcc15
and GND1 of PCB2 15V + 10%?
Insufficient voltage for PCB1.
Is the voltage between Vcc05
and GND of PCB1 5V + 5%?
Is the voltage between Vcc12
and GND of PCB1 12V + 10%?
Remove CN201 on PCB2.
Is the voltage between CN201 #3
and GND1 more than 1V?
Is the voltage between GND
of PCB1 and PC1 2# of PCB2
several voltage?
PCN202
PC1-2#
PC1
CN201 CN202
CN201-3#
TB1
TB2
PCN7 PCN11 CN1
LED4
CN19
PCB1
Transformer
Replace PCB2
Replace PCB2
Replace PCB1
or Transformer
Replace PCB1
or Transformer
Replace
Fan Motor
Replace PCB2
Electrical
Box
LED
PCB2
CN201
CN203
PCN203