152
Troubleshooting
Alarm
Code
22
Abnormality of Thermistor for Outdoor Air Temperature
(Outdoor Unit Ambient 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 0.2kΩ) or disconnection (more than 500kΩ) of the thermistor is
detected during the operation.
Yes
Yes
Connect it.
No
Faulty Thermistor
Faulty O.U. PCB
No
Is the thermistor
connected to THM7
(Ta, color: red) of
O.U. PCB?
Is resistance of THM7
between 0.2k
Ω
and
500k
Ω
?
Cause Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Faulty Thermistor
for Outdoor Unit
Ambient
Check resistance.
Replace thermistor
if faulty.
Fault
Check wiring to
O.U. PCB.
Repair wiring and
connections.
Incorrect Connection
Replace O.U. PCB
and check operation.
Replace O.U. PCB
if faulty.
Faulty O.U. PCB
O.U. PCB: Outdoor Unit PCB
Outdoor Unit
Ambient
Thermistor
(THM7)
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