Check code
Abnormal points and detection methods
Causes and check points
Abnormal if any of the following thermistor detected to be open/ short.
TH21: Air inlet thermistor
TH22: Liquid pipe temperature thermistor
TH23: Gas pipe temperature thermistor
Contact failure of connectors
Characteristic defect of thermistor
Disconnection or contact failure of thermistor
Defective indoor controller board
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis
Remedy
connection
5101, 5102, 5103
Air inlet thermistor trouble (TH21)
Liquid pipe temperature thermistor trouble (TH22)
Gas pipe temperature thermistor trouble (TH23)
<Detected in indoor unit>
No
No
Yes
Yes
Is it connected properly?
Is the resistance of
the thermistor normal?*
Connect the wiring properly.
Replace the thermistor.
Replace the indoor controller board.
Check the connection of
thermistor wiring for looseness
or disconnection.
< Thermistors for low temperature>
■ Check code and trouble
Check code
Thermistor
Connector
Trouble
5101
TH21
CN20
Air inlet thermistor trouble
5102
TH22
CN44/CN21
Liquid piping temperature thermistor trouble
5103
TH23
CN44/CN29
Gas piping temperature thermistor trouble
■ Thermistor characteristic
Turn the power OFF to remove the connector for the thermistor, then check the resistance with a tester.
(At the ambient temperature 10
to 30
:
[50 to 86
-
F]
)
Normal
Abnormal
4.3 to 9.6k
"
Open or short
* Symbols for thermistors and connectors may be different depending on the model. Please refer to its wiring diagram.
64
OCH575
Summary of Contents for PUMY-P200YKM
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