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58
12.4.22 F17 (Indoor Standby Units Freezing Abnormality)
Malfunction Decision Conditions
When the different between indoor intake air temperature and indoor pipe temperature is above 50°F or indoor
pipe temperature is below 30.2°F
Remark:
When the indoor standby unit is freezing, the outdoor unit transfers F17 error code to the corresponding indoor
unit and H39 to other indoor unit(s).
Malfunction Caused
Wrong wiring connection
Faulty sensor
Faulty expansion valve
Troubleshooting
When F17 indication happens.
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Check the system wiring connection.
YES
YES
NO
Is the wiring connection ok?
Perform Auto Wiring to correct the wiring
connection.
NO
Replace the indoor intake air or indoor
pipe temperature sensor.
NO
Replace the solenoid coil or expansion
valve.
Replace outdoor unit PCB.
YES
Does it conform to the sensor characteristic chart?
Check the expansion valve.
Is the expansion valve ok?
Check the indoor intake air and indoor pipe temperature
sensors.
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