155
Troubleshooting
Alarm
Code
25
Abnormality of Thermistor for Outdoor Unit Heat Exchanger Gas Pipe (Tg/Tbg)
● 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. (For
the combination of outdoor units, the alarm code is displayed on PCB of outdoor unit A.) Additionally for the outdoor unit
number and compressor number with abnormal thermistor, check the alarm code history.
★
This alarm code is indicated when a short circuit (less than 0.2kΩ) or disconnection (more than 840kΩ) of the thermistor is
detected continuously for 8 minutes during the operation.
Yes
Yes
Connect it.
No
Faulty O.U. PCB
No
Are thermistors connected to
THM11 (Tg) or THM23 (Tbg)
on O.U. PCB?
Is resistance of the
thermistors between
0.2kΩ and 840kΩ?
Faulty Thermistor
Refer to "Alarm Code 24"
for thermistor resistance.
Cause Check Item
Action
(Turn OFF Main Switch)
Phenomenon
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
Faulty
Outdoor Unit
Gas Pipe
Thermistor
Tg: Thermistor for Outdoor Gas Pipe
Tbg: Thermistor for Super Cooling Bypass Line
O.U. PCB: Outdoor Unit PCB
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