Daikin Heat Pump Error Codes
Complete list of Daikin heat pump error codes with causes and how to fix them.
A1
🟡
Daikin Heat Pump error code A1: PCB defect (indoor unit).
Technician Required
A3
🟢
Daikin Heat Pump error code A3: Drain level system malfunction.
✓ DIY Possible
A5
🟢
Daikin Heat Pump error code A5: Freeze-up or high-pressure protection.
✓ DIY Possible
A6
🟢
Daikin Heat Pump error code A6: Fan motor overload / overcurrent.
✓ DIY Possible
A7
🟢
Daikin Heat Pump error code A7: Swing flap motor malfunction.
✓ DIY Possible
A9
🟢
Daikin Heat Pump error code A9: Electronic expansion valve malfunction.
✓ DIY Possible
AH
🟢
Daikin Heat Pump error code AH: Humidity sensor malfunction.
✓ DIY Possible
AJ
🟢
Daikin Heat Pump error code AJ: Capacity setting error.
✓ DIY Possible
C4
🟢
Daikin Heat Pump error code C4: Thermistor malfunction (liquid pipe sensor).
✓ DIY Possible
C5
🔴
Daikin Heat Pump error code C5: Thermistor malfunction (gas pipe sensor).
Technician Required
C9
🟢
Daikin Heat Pump error code C9: Thermistor malfunction (indoor air sensor).
✓ DIY Possible
CA
🟢
Daikin Heat Pump error code CA: Thermistor malfunction (discharge air sensor).
✓ DIY Possible
CJ
🟢
Daikin Heat Pump error code CJ: Thermistor malfunction (humidity sensor).
✓ DIY Possible
E1
🟡
Daikin Heat Pump error code E1: PCB defect (outdoor unit).
Technician Required
E3
🔴
Daikin Heat Pump error code E3: High pressure protection.
Technician Required
E4
🔴
Daikin Heat Pump error code E4: Low pressure protection.
Technician Required
E5
🟢
Daikin Heat Pump error code E5: Inverter overcurrent protection.
✓ DIY Possible
E6
🟡
Daikin Heat Pump error code E6: Compressor motor lock protection.
Technician Required
E7
🟢
Daikin Heat Pump error code E7: Fan motor overcurrent protection.
✓ DIY Possible
E8
🟢
Daikin Heat Pump error code E8: Input overcurrent protection.
✓ DIY Possible
EA
🟢
Daikin Heat Pump error code EA: Four-way valve defect.
✓ DIY Possible
EC
🔴
Daikin Heat Pump error code EC: Refrigerant overcharge or expansion valve …
Technician Required
EE
🟢
Daikin Heat Pump error code EE: EEPROM error.
✓ DIY Possible
F3
🟢
Daikin Heat Pump error code F3: Discharge pipe high temperature protection.
✓ DIY Possible
H6
🟢
Daikin Heat Pump error code H6: Position sensor (DC motor) abnormal.
✓ DIY Possible
H7
🟢
Daikin Heat Pump error code H7: Fan motor position sensor malfunction.
✓ DIY Possible
H8
🟢
Daikin Heat Pump error code H8: CT (current transformer) input circuit …
✓ DIY Possible
H9
🟢
Daikin Heat Pump error code H9: Outdoor air thermistor malfunction.
✓ DIY Possible
J1
🟢
Daikin Heat Pump error code J1: Pressure sensor malfunction.
✓ DIY Possible
J3
🟢
Daikin Heat Pump error code J3: Discharge pipe thermistor malfunction.
✓ DIY Possible
J5
🟢
Daikin Heat Pump error code J5: Suction pipe thermistor malfunction.
✓ DIY Possible
J6
🟢
Daikin Heat Pump error code J6: Outdoor coil thermistor malfunction.
✓ DIY Possible
J8
🟢
Daikin Heat Pump error code J8: Liquid pipe thermistor malfunction.
✓ DIY Possible
J9
🟢
Daikin Heat Pump error code J9: Subcooling coil outlet thermistor malfunction.
✓ DIY Possible
L1
🟡
Daikin Heat Pump error code L1: PCB malfunction (outdoor unit).
Technician Required
L4
🟢
Daikin Heat Pump error code L4: Radiation fin temperature rise protection.
✓ DIY Possible
L5
🟢
Daikin Heat Pump error code L5: Output overcurrent protection.
✓ DIY Possible
L8
🟡
Daikin Heat Pump error code L8: Output overcurrent protection (compressor).
Technician Required
L9
🟡
Daikin Heat Pump error code L9: Compressor startup failure.
Technician Required
LC
🟡
Daikin Heat Pump error code LC: Communication error between inverter and control …
Technician Required
P1
🟢
Daikin Heat Pump error code P1: Phase loss detection.
✓ DIY Possible
P4
🟢
Daikin Heat Pump error code P4: Radiation fin thermistor malfunction.
✓ DIY Possible
U0
🔴
Daikin Heat Pump error code U0: Insufficient refrigerant.
Technician Required
U2
🟢
Daikin Heat Pump error code U2: Low voltage or overvoltage protection.
✓ DIY Possible
U4
🟡
Daikin Heat Pump error code U4: Communication failure between indoor and outdoor …
Technician Required
UA
🟢
Daikin Heat Pump error code UA: Combination error.
✓ DIY Possible
UC
🟢
Daikin Heat Pump error code UC: Centralized control system mismatch.
✓ DIY Possible