Troubleshooting
Electrical Control System 181
2.4 Resolving Typical Malfunctions
2.4.1 For Indoor Units
2.4.1.1 Temperature Sensor Open or Short Circuit
If the sampling voltage is lower than 0.06V or higher than 4.94V,
the LED will display the failure.
● Wiring mistakes
● Faulty sensor
● Faulty PCB
Check connections
between temperature
sensor and PCB. Are the
connections in working
order?
Check connections
between temperature
sensor and PCB. Are the
connections in working
order?
Correct the connections
Correct the connectionsNo
Yes
No
Replace the sensor
Replace the sensor
Replace the indoor PCB
Replace the indoor PCB
Measure the resistance value
of the sensor via Appendix 1
Measure the resistance value
of the sensor via Appendix 1
Is it normal?
Is it normal?
Yes
2.4.1.2. Outdoor Unit Malfunction
Is the main board
displaying an error?
Is the main board
displaying an error?
Power off, then restart the unit 2
minutes later. Does the outdoor main
board display an error code a few
minutes later?
Power off, then restart the unit 2
minutes later. Does the outdoor main
board display an error code a few
minutes later?
No
Yes
Refer to the prescribed
steps for resolving the
issue
Refer to the prescribed
steps for resolving the
issue
Yes
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