Hitachi RAS-5HVRNM1E Service Manual page 285

8 Troubleshooting
57
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 the revolution pulse output from the fan motor is 10 rpm or less and the reverse
revolution signal is detected. The fan motor is stopped once, and restarted after 10 seconds.
If it occurs more than 10 times in 30 minutes, this alarm is indicated. The abnormality occurs when the fan motor is
stopped.
Restart operation
Does the motor run?
No
Alarm code is not indicated
Does the fan stop by the foreign
matter?
No
Check to remove the connector connection of CN15 (on PCB1)
and CN201, CN202, PCN201, PCN203 (on PCB5).
Are the connectors abnormal?
Good
Replace the fan motor
Restart operation
Does the motor run?
No
Alarm code is not indicated
N O T E
• In the case that the fan motor does not run even the PCB1 is replaced, replace PCB5.
• Check to ensure that DC Fan Motor is checked according to the item
for ES Series, see on page 312.
277
SMGB0060 rev. 1- 12/2010
Abnormality of fan motor protection (DC fan motor) for IVX series
Yes
Yes
Faulty
Restart operation
Does the motor run?
No
Yes
This alarm is indicated due
to detected overcurrent by
the contrary wind. This is
normal.
Remove the foreign matter.
Connect it correctly.
Yes
This is normal
This is normal
Replace the PCB1
Procedure of checking other main parts
8