Hitachi RAS-(4-6)HVRNS2E - Abnormal Operation of Thermistor for the KPI (Room Temperature Thermistor) for IVX Series

8 Troubleshooting
280
SMGB0064 rev.0 - 08/2011
Alarm code
96
Abnormal operation of Thermistor for the KPI (room Temperature Thermistor) for IVX series
• 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.
- This alarm code is displayed when the thermistor is short-circuited or cut during the KPI operation. The system is
automatically restarted when the fault is removed
Is THM1 connected to (intake)
of PCB?
Connect it
No
Yes
Is the resistance of THM1
between 0.24kΩ and 840kΩ?
Faulty thermistor
No
Yes
Faulty PCB
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Faulty air inlet thermistor
Fault Check the resistance Replace the thermistor if faulty
Incorrect connection Check the connection
Repair the wiring and the
connections
Faulty PCB
Replace PCB and check the
operation
Replace PCB if faulty
N O T E
• This data is applicable to the following thermistors:
- Indoor unit discharge air temperature
- Indoor unit liquid refrigerant temperature
- Indoor unit air inlet temperature
- Outdoor temperature
- Outdoor unit evaporating temperature
- Indoor unit gas piping