Hitachi FSXN Series Service Manual page 233

8 Troubleshooting
57
Alarm code
• The RUN indicator flashes and the ALARM indication is displayed on the remote control switch.
• The unit no., the alarm code and the unit code are alternatively displayed in the temperature setting section and the unit
no. and alarm code are displayed on the outdoor unit's PCB1 display.
* The IPM (Transistor module) has detecting function of abnormality.
This alarm is indicated when the anomaly is detected ten times in thirty minutes (retry operation is carried out up to the
ninth time the anomaly is detected).
Activation conditions:
Abnormal current to the transistor module, such as a short-circuit or earth leakage, or
Overcurrent, or
Decrease in control voltage.
Turn OFF the power supply.
Disconnect the faston terminal (U, V, W)
and turn ON the DSW1-#1 of fan controller.
And then restart the operation.
Does it trip?
Yes, it trips.
Is the heat exchanger of
outdoor unit clogged?
No
N O T E
When the unit is applied the excessive current due to lightning or other causes, alarm code "57" or Inverter
stoppage code (IT) "11" is indicated and the unit cannot be operated. In this case, check to ensure the surge
absorver (SA) in the noise filter (NF1, NF2). The surge absorver may be damaged if the inner surface of the SA is
black. If so, replace the surge absorver.
If the inside of the surge absorver is normal, turn OFF the power supply and wait for LED201 (red) of PCB2 OFF
(approximately 5 minutes) and turn ON power supply again.
Position of surge absorver:
SA
NF1
NF2
SP-226-1
OKAYA 250VAC/30A
LFB-14930-3MA
Lot
SA
SA: Surge absorver.
227
SMGB0065 rev. 1 - 12/2010
Activation of fan controller protection.
No
Yes
E
PCB1: Control PCB in Outdoor Unit
Check the fan motor.
Remove the clogging or
replace the heat exchanger.
Replace the fan controller.
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