Hitachi EV-1.5N1, Service Manual

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8. Troubleshooting
248
SMGB0079 rev.0 - 01/2013
Alarm code
57
Abnormality of fan motor protection (DC fan motor)
for RAS-(3-6)H(V)NPE and RAS-(8-12)HN(P/C)(E)
• 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 5 minutes after the first abnormality occurs, this alarm is indicated. The abnormality
occurs when the fan motor is stopped by slugging.
Check the connectors CN14 and CN15 on PCB1 and
CN203, CN204, CN201, CN202, PCN201 and PCN202
on inverter PCB
Does thermal fuse
(RS1/2 or RS) on inverter
PCB blow out?
Replace inverter PCB
Check the fuses EF1, EF2
and EF3 on PCB1, and
EF1 on inverter PCB
and the fuse
N O T E
Check to ensure that DC Fan Motor is checked according to the item Procedure of checking other main parts .