F17

Malfunction Decision Conditions

  • When the different between indoor intake air temperature and indoor pipe temperature is above 10°C or indoor pipe temperature is below -1.0°C.
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
⚠
Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.
↓
Check the system wiring connection.
↓
Is the wiring connection ok?
NO
→
  • Perform Auto Wiring to correct the wiring connection.
YES
↓
Check the indoor intake air and indoor pipe temperature sensors.
↓
Does it conform to the sensor characteristic chart?
NO
→
  • Replace the indoor intake air or indoor pipe temperature sensor.
YES
↓
Check the expansion valve
↓
Is the expansion valve ok?
YES
→
  • Replace the solenoid coil or expansion valve
NO
↓
NO
►
  • Replace outdoor unit PCB
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