Samsung AC071MN4PKH Service Manual page 97

15. Current sensor error : E468
- Check the EEPROM data.
- Check the PCB operation.
16. IPM (IGBT Module) or PFCM temperature sensor error : E474
IPM overheat error for outdoor unit inverter compressor : E500
- Check whether IPM is correctly assembled on the heatproof plate.
- Check whether the inlet is blockage.
- If there is a defect, replace the IPM.
17. How to check Booster Fan
1) In case of do not not operate 1 Booster Fan
Action method : Remove the Booster Fan connector wire and cross-assembling the another Booster Fan wire and
then horizontally or intermediate or swing operate.
Type : When the existing Booster Fan does not operate, replace the Booster Fan.
Type : If type 1 is not defective, Booster Fan Wire 4 (Red Wire),
3 (Black Wire) pin voltage : When it is more than 2.7V, replace the PCB.
2) In case of do not operate 3 Booster Fan (all Fan)
Action method : horizontally or intermediate or swing set up.
Type : Booster Fan Wire 1 (Orange Wire), 3 (Black Wire) pin voltage : When it is less than DC12V, replace the PCB.
Type : If type 1 is not defective, Booster Fan Wire 4 (Red Wire),
3 (Black Wire) pin voltage : When it is more than 2.7V, replace the PCB.
Type If type 2 is not defective, Booster Fan Wire 2 (White Wire),
3 (Black Wire) pin voltage : When it is approximately 5V, replace the PCB.
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Troubleshooting