Hitachi FS3 Series, Service Manual

Page: 64 / 240

1
56
TROUBLESHOOTING
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.
Rated Current
Model
380-415V 50Hz
RAS-5FS3(G), RAS-8FS3(G), RAS-10FS3(G) 14.0 / 25.0
RAS-16FS3(G), RAS-20FS3(G) 16.5 / 30.0
Is the cause of stoppage "
óC
" of
troubleshooting by 7-segments
display "2" or "4"?
"2"
Refer to next page.
"4"
Restart operation.
Is the compressor current larger than
activation current?
Yes (The circuit board is normal.)
Is discharge pressure high?
Check pressure and refrigeration
cycle.
No
Smaller than
activation
current.
Check for clogging of the heat
exchanger.
Check the fan motor.
Check the diode module. 1*)
Abnormal
Replace the diode module.
Normal
Check the inverter circuit board
(PCB3) connection. 2*)
Abnormal
Connect it correctly.
Normal
The inverter circuit board is faulty.
Replace it.
*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.