Check code
5106
Outdoor temperature thermistor (TH7) open/short
Abnormal points and detection methods Causes and check points
Abnormal if TH7 detects to be open/short
Open: -40 [-40°F] or less
Short: 90 [194°F] or more TH7: Outdoor temperature thermistor
Disconnection or contact failure of connectors
Characteristic defect of thermistor
Defective outdoor controller board
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Diagnosis Remedy
The black square (■) indicates a switch position.
No
Yes
Yes
Yes
No
No
Is there any abnormality such
as a disconnection, looseness or
breakage?
Is the detected resistance normal?
Is the detected temperature normal?
Connect the wiring/connector properly.
Replace it in case of a breakage.
Replace the thermistor.
Replace the controller board
(Malfunction of thermistor circuit).
No abnormality
( A connector contact failure is suspected).
Check the wiring and connector connection of TH7.
Disconnect the connector to check the
resistance of TH7 using a tester
Check a temperature of TH7.
ON
OFF
12345678
SW1 Setting
Display on LED1,2
Unit
-99.9 999.9 °F
The detected temperature of thermistor (TH7)
The detected temperature of thermistor (TH7)
can be displayed by an operation of SW1 on the
can be displayed by an operation of SW1 on the
outdoor controller board.
outdoor controller board.
The detected temperature of TH7 can be displayed by
an operation of SW1 on the outdoor controller board.
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