Samsung AC018JN4DCH/AA Service Manual page 84

Troubleshooting
1. Current sensor error: Upload EEPROM to the main PBA of the outdoor unit.
After checking for normal operation of PCB, replace the inverter PCB.
2. Compressor Vlimit error: E465
If the compressor is abnormally run, replace the compressor and then ensure that it works normally.
If the compressor is normally run, check the assembling between the heatproof plate and the inverter PBA and then if there is no abnormality,
replace the inverter PBA.
3. OTP error: E471
Upload EEPROM to the main PBA of the outdoor unit.
4. Capacity inconsistence error: E556
Check the model name between the outdoor and indoor unit and re-enter the option code to the indoor unit.
5. 3-phase power cable disconnection: E424
Check for disconnection of the 3-phase (open) power cable, and check the disconnected EMI PBA fuse.
[RC HXH Series Confirmation Matters]
6. Outdoor unit freezing detection (at the stop of the compressor): E403
Outdoor overload protection control (at the stop of the compressor): E404
- Check whether the fan and the motor operate normally.
- Check the operation of EEV.
- Check the temperature sensor of the indoor unit heat exchanger.
- Check the indoor unit inlet blocking.
7. Outdoor unit compressor discharging temperature protection control: E416
- Check for lack of refrigerant.
- Check the blocking of the solenoid valve.
- Check the malfunction of the exhaust temperature sensor.
- Check EEV.
8. Error of impossibility to operate heating at outdoor temperature exceeding 30°C: E440
Error of impossibility to operate cooling at outdoor temperature of -5°C or under: E441
- It is not the error code in the product and it is a specification to protect the product by limiting the temperature scope of use.
- Use by referring to the temperature scope of use on the product manual, etc.
9. OLP overheating and compressor stop: E463
- Check the opening of the sub-valve.
- Check the amount of the cooling water.
- Check OLP sensor.
10. Current sensor error: E468
- Check EEPROM data.
- Check PCB operation.
11. 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 blocked.
- If there is a defect, replace IPM.
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