Check code
Abnormal points and detection methods Causes and check points
Abnormal if TH8 detects a temperature outside the specifi ed range during
compressor operation.
TH8: Heatsink temperature thermistor
Blocked outdoor fan
Malfunction of outdoor fan motor
Blocked airfl ow path
Rise of ambient temperature
Characteristic defect of thermistor
Malfunction of input circuit on outdoor power board
Malfunction of outdoor fan driving circuit
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis Remedy
Is 5110 displayed when restart?
4230
Heatsink temperature trouble
No
Yes
No
No
Yes
Yes
No
No
Yes
Yes
Is 5110 displayed when restart?
Does the fan rotate during
compressor operation?
Is there any obstacle which blocks
an airfl ow around the heatsink?
Is there any abnormality such
as a disconnection, looseness or
breakage?
Is the resistance normal ?
Refer to the diagnosis of check code 5110.
Refer to the diagnosis of check code 4400.
Replace the thermistor
(Defective thermistor).
Replace the outdoor power board
(Defective outdoor power board).
Improve the airfl ow path.
Connect the wiring/connector properly.
Replace it in case of a breakage.
Check the wiring and connector connection TH8.
Check the resistance of TH8.
(air path blocked)
(no obstacle)
0 ···180kΩ 25 ···50kΩ 50 ···17kΩ
70
···8kΩ 90 ···4kΩ
TH8 temp. - resistance characteristic
55
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