Daikin SKYAIR Service Manual page 25

Service Diagnosis
Description Heat exchanger overheat
Supposed Cause 1. The installation space is not large enough.
2. Faulty outdoor fan motor.
3. Faulty EXV.
4. Faulty outdoor heat exchanger thermistor.
5. Faulty stop valve.
6. Dirty heat exchanger.
7. Unit overcharge.
8. Defective outdoor unit PCB.
Troubleshooting
*Remark:
Refer to Appendix A for thermistor resistance checking procedures (Item 1, page 32).
Refer to Appendix A for Inverter unit refrigerant check procedures (Item 2, page 33).
Refer to Appendix A for Installation condition check (Item 3, page 33).
For electronic expansion device checking procedures, please refer to Daikin procedures.
22
Check the installation space.
Check the
installation
condition.
OK
Check the
outdoor fan.
OK
Check the
electronic expansion
valve.
OK
Check the
outdoor heat exchanger
thermistor.
OK
F6
Malfunction
Malfunction
Malfunction
Malfunction
Change the installation
location or direction.
Clean the outdoor heat
exchanger.
Replace the outdoor fan
motor.
Reconnect the connector or
fan motor lead wires.
Replace the electronic
expansion valve or the coil.
Replace the outdoor unit PCB.
Replace the outdoor heat
exchanger thermistor.
Replace the outdoor unit PCB.