Hitachi RAS-(4-12)HRNM(2)(E) - Abnormal Operation of the Thermistor for the Indoor Unit Heat Exchanger Liquid Pipe Temperaturealarm Code(Freeze Protection Thermistor)

8 Troubleshooting
237
SMGB0064 rev.0 - 08/2011
8
Alarm code
13
Abnormal operation of the thermistor for the indoor unit heat exchanger liquid pipe temperature
(freeze protection thermistor)
• 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 (less than 0.24 kΩ) or cut (greater than 840 kΩ)
during the cooling process or the heating process. The system is automatically restarted when the fault is removed.
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Faulty freeze protection thermistor
Fault Check the resistance Replace the thermistor if faulty
Incorrect connection Check the connection Repair the wiring and connections
Faulty PCB
Replace PCB and
check the operation
Replace PCB if faulty