Hitachi RWM-(H)FSN3E, Service Manual

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12 Troubleshooting
SMGB0070 rev. 1 - 08/2011
386
Alarm code
57
Abnormality of fan motor protection (DC fan motor)
• 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.
- The fan motor stops when the revolution output from the fan motor is 20 rpm (RAS-2HVRN2) or 10 rpm (RAS-(3-
10)H(V)RNME-AF) or lower during 30 seconds (RAS-2HVRN2) or 10 seconds (RAS-(3-10)H(V)RNME-AF) after
the fan motor activation.
- The alarm is indicated when the abnormality is repeated 4 times within 5 minutes (RAS-2HVRN2) or 10 times
within 30 minutes (RAS-(3-10)H(V)RNME-AF) after the first detection.
Check fuse EF4
Check for correct wiring
Yes
Does the
motor run?
Removed the foreign matter
Restart operation
No
This is normal
No
Restart operation
Faulty
Connect it correctly
Good
Alarm code is not indicated
No
Yes
No
Replace the fan motor
Does the fan
stop by the foreign
matter?
Yes
Yes
Alarm code is not indicated
Check to remove the connector connection of RAS-2HVRN2: CN24 (on PCB1)
RAS-(3-10)H(V)RNME-AF: CN15 (on PCB1) and CN201, CN202, PCN201, PCN203 (on PCB5).
Are the
connectors
abnormal?
Does the
motor run?
Restart operation
Does the
motor run?
This is normal
Replace the PCB1
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
Procedure of checking other main parts.