Hitachi RAS-5HVRNM1E Service Manual page 216

8 Troubleshooting
02
Alarm code
• The RUN LED flickers 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 PCB.
– This alarm is indicated when one of safety devices is activated during compressor running.
Does CMC1 ON
when starting?
Yes
Does CMC1 turn
ON for more than
3 seconds?
Yes
Normal PCB1
Yes
Check activation of the following safety devices and the power
source wiring.
Remove the cause after checking.
(1) High pressure switch
(PSH: 4.15MPa (41.5 kgf/cm²G))
(2) Is the power source line reverse phase or open phase?
If the wiring is incorrect, perform the wiring correctly again.
208
SMGB0060 rev. 1- 12/2010
Activation of the safety device in the outdoor unit for IVX series
No
Is the voltage 240V
or 220V existing at
the #1 to #3 of PCN9
during Y52C is ON?
Yes
No
No
Yes
Is the CMC1 coil
broken?
No
No
Is the protective
device still operating?
Yes
Yes
Is the protective
device still operating?
No
Check item
Connector No.
PCN9
Faulty PCB1.
Faulty PCB1.
Faulty CMC1
Pin No.
#1 to #3