Hitachi RAS-4-HNCE - Troubleshooting in Check Mode

8. Troubleshooting
239
SMGB0079 rev.0 - 01/2013
8
Alarm code
53
Activation of transistor module (RAS-3HVNPE / RAS-(4-6)H(V)NCE)
• The RUN LED ickers 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.
- IPM or Dip IPM and PCB2 have detecting function of abnormality. This alarm is indicated when the transistor mod-
ule detect the abnormality 7 times in 30 minutes including 7. Retry operation is performed up to the occurrence of
6 times.
Conditions:
• The abnormal current such as short circuited, grounded or the overcurrent occurs at the transistor module.
• The temperature at transistor module increases abnormally.
• The control voltage decreases.
• The angle difference between the shaft in compressor and the shaft in the control program exceeds +60deg.
Yes
Yes
Turn OFF power,
disconnect U, V, W
from compressor
terminals and restart.
Does the protecting
function activate? *3)
No
Is heat exchanger of
clogged?
Remove clogging or
replace heat exchanger.
Check the compressor.
Check the compressor.
Replace it if faulty.
Check fan motor.
No
Check
the compressor.
Normal
Failure of Inverter PCB.
Replace it.
Check pressure and
refrigerant cycle.
Is high pressure
increased?
Check clogging for
heat exchanger.
Abnormal
(Itc=1, 12)*
(Itc=21)*
Restart operation.
Compressor
stops after
few minutes.
Compressor
stops
immediately.
Faulty Inverter PCB
Replace it.
* Refer to the item 1.2.8 (D)
“Cause Code of Inverter Stoppage” for details.
N O T E
• *1)PerformthehighvoltagedischargeworkbyreferringtotheitemProcedureofcheckingothermainparts,
beforecheckingandreplacingtheinvertercomponents.
• *2) Regarding replacing orchecking method forinverter components, refer toitem Procedure of checking
othermainparts.
• *3)TurnONtheNo.1switchofthedipswitchDSW1onPCB2(inverter)whenrestartingwithdisconnectingthe
terminalsofthecompressor.Aftertroubleshooting,turnOFFtheNo.1switchofthedipswitchDSW1onPCB2.
• Whenthealarmcode“53”isindicated,theoutdoorfanmotor(DCmotor)ensurethatDCfanmotorischecked
accordingtotheitemProcedureofcheckingothermainparts.