Hitachi Utopia RPI-2.5HRG Service Manual page 53

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 unit No. and alarm code are indicated on the display of the outdoor unit PCB.
# This alarm is indicated when the revolution pulse output from the fan motor is 10rpm or less and the
reverse revolution signal is detected. The fan motor is stopped once, and restarted after 10 seconds.
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?
Does the fan stop by the
foreign matter?
Check to remove the connector CN14 and CN15 on PCB1 and CN203, CN204,
CN201, CN202, PCN201 and PCN202 on ISPM or not.
Are the connectors abnormal?
Replace the fan motor.
Restart operation.
Does the motor run?
1-50
Abnormality of Fan Motor Protection
Yes
No
Alarm code is not indicated.
Yes
No
Faulty
Good
Restart operation.
Does the motor run?
Yes
No
Alarm code is not indicated.
This alarm is indicated due to
detected overcurrent by the
contrary wind. This is normal.
Remove the foreign matter.
Yes
No
In the case that the fan motor does not run
even the PCB1 is replaced, replace ISPM.
Connect it correctly.
This is normal.
This is normal.
Replace the PCB1.