Hitachi FSG Series Service Manual page 64

1
TROUBLESHOOTING
56
Alarm Code
52
Protection Activation Against Instantaneous Overcurrent of Inverter (1)
n "RUN" light flickers and "ALARM" is indicated on the remote control switch.
n 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 code is indicated when the electronic thermal relay for the inverter is activated 3 times including
3 in 30 minutes. Retry operation is performed up to the occurrence of 2 times.
Conditions: Inverter current with 105% of the rated current, € runs continuously for 30 seconds or ó runs
intermittently and the accumulated time reaches up to 3.5 minutes, in 10 minutes.
RAS-5FS3(G), RAS-8FS3(G), RAS-10FS3(G)
Is the cause of stoppage "óC" of
troubleshooting by 7-segments
display "2" or "4"?
"4"
Restart operation.
Is the compressor current larger than
activation current?
No
Smaller than
activation
current.
Check the diode module. 1*)
Normal
Check the inverter circuit board
(PCB3) connection. 2*)
Normal
*1): Regarding the checking method for diode module, refer to page 1-92.
*2): Regarding or replacing the checking of inverter components, refer to page 1-90 regarding electrical discharge.
Model
RAS-16FS3(G), RAS-20FS3(G)
"2"
Yes (The circuit board is normal.)
Abnormal
Abnormal
Rated Current
380-415V 50Hz
14.0 / 25.0
16.5 / 30.0
Refer to next page.
Is discharge pressure high?
Check pressure and refrigeration
cycle.
Check for clogging of the heat
exchanger.
Check the fan motor.
Replace the diode module.
Connect it correctly.
The inverter circuit board is faulty.
Replace it.