Hitachi RAS-8FSXN - Page 236

Alarm code
5b
Activation of fan controller overcurrent protection device (2).
• 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.
* This alarm is indicated when the instantaneous overcurrent occurs ten times in thirty minutes (retry operation is carried
out up to nine times).
Activation condition: fan controller current with 150% of the rated current
PCB1: Control PCB in Outdoor Unit
PCB2: Inverter PCB
Is the supply voltage
220V±10% or 240V±10%?
Is the fan motor
running current as
same as rated
current? *2)
Restart operation.
Does it trip soon?
Y
es
Yes
Yes
Yes It trips.
No
No
No
No
No
It trips
immediately
.
Check the fan motor.
Check the fan motor.
Is there any cause
of instantaneous
voltage decrease?
It
trips
occasionally
.
It trips after a
certain pe
riod.
Turn off power and
disconnect U
, V, W
from fan controller
terminals.
Turn ON #1 of DSW1
on PCB2 and restart.
Does it trip?
Replace
the fan controll
er.
Replace the
fan controll
er.
Yes
Yes
Yes
No
No
No
Check the capacity
and wi
r
ing of the
power source.
Replace
the fan controll
er.
Check
fan controller *1)
Nor
mal
Replace
fan controll
er.
Faulty
Is it 187V or more during operation?
Is it 187V or more during operation
when other devi
ces are operating?
Check the capacity
and wir
ing of the
power source..
*1): Carry out the electrical discharge when fan controller is checked or replaced, refer to: Checking procedures
for other
main parts, see on page 267.
*2): Regarding the activation current value setting, refer to Inverter specifications, see on page 330.
8 Troubleshooting
230
SMGB0065 rev. 1 - 12/2010