145
Troubleshooting
Alarm
Code
12
Abnormality of Thermistor for Indoor Unit Outlet Air Temperature
(Outlet Air Thermistor)
● The RUN indicator (Red) is ashing
● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on
LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB.
★
This alarm code is indicated when a short circuit (less than 0.24kΩ) or disconnection (more than 840kΩ) of the thermistor
is detected during the heating or cooling operation. The operation is automatically restarted when the malfunction is
removed.
Yes
Connect it.
No
Faulty Thermistor
Refer to "Alarm Code 11"
for thermistor resistance.
Yes
Faulty I.U. PCB
Is the thermistor
connected to THM2
(outlet air) of I.U. PCB?
No
Is resistance of THM2
between 0.24kΩ and
840kΩ?
Cause Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Faulty Outlet Air
Thermistor
Check resistance.
Replace thermistor
if faulty.
Fault
Check wiring to
I.U. PCB.
Connect wiring
correctly.
Incorrect Connection
Replace I.U. PCB
and check operation.
Replace I.U. PCB
if faulty.
Faulty I.U. PCB
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