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Daikin Air Conditioner Not Turning On

Daikin air conditioning systems are well-known for their exceptional performance and durability, yet even the best appliances can encounter issues. One particularly vexing problem that users may confront is the Daikin air conditioner refusing to turn on. In this extensive troubleshooting guide, we will delve into the myriad causes of this issue and provide detailed solutions to help you navigate through the intricacies of getting your Daikin AC up and running again.

Troubleshooting Steps

1. Power Supply Issues:

– Cause: Begin by checking the power supply. Is there a power outage or has the circuit breaker tripped?

– Solution: Restore power, reset the circuit breaker, and ensure the unit is securely plugged in.

2. Faulty Remote Control:

– Cause: Inspect the remote control for signs of dead batteries or physical damage.

– Solution: Replace batteries or acquire a new remote control if needed. Ensure it’s properly synced with the AC unit.

3. Thermostat Settings:

– Cause: Verify that the thermostat settings are correct, as incorrect settings can prevent the AC from turning on.

– Solution: Ensure the thermostat is set to the desired temperature and mode (cooling/heating). Check for any scheduling issues.

4. Air Filter Blockage:

– Cause: Clogged air filters can impede airflow and trigger a system shutdown.

– Solution: Make it a habit to clean or replace air filters regularly to maintain optimal performance and indoor air quality.

5. Condensate Drain Issues:

Cause: A blocked condensate drain can activate a safety feature, preventing the unit from starting.

– Solution: Clear the condensate drain line to ensure proper drainage. Consider adding periodic maintenance to your routine.

6. Tripped Safety Switch:

Cause: Some Daikin units have safety switches that can trip due to various reasons.

Solution: Consult the user manual for instructions on resetting the safety switch. Follow the manufacturer’s guidelines precisely.

7. Refrigerant Issues:

Cause: Low refrigerant levels or leaks can severely impact the system’s ability to operate.

Solution: Given the technical nature of refrigerant-related problems, consult a professional technician for identification and resolution.

8. Faulty Capacitor or Compressor:

Cause: Malfunctioning components like capacitors or compressors can lead to startup failures.

– Solution: Seek the expertise of a qualified HVAC technician for a thorough diagnosis and replacement of faulty parts.

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9. Electrical Problems:

Cause: Wiring or electrical component issues can hinder the AC from turning on.

Solution: Employ the services of a qualified electrician or technician to inspect and rectify any electrical problems. Safety should be a top priority.

If there’s a fault with the Daikin system, there will be fault codes sometimes shown on the remote control or wall-mounted controller. Or you may have to complete a sequence on the remote controller to get the code to appear, certainly, here’s an extended list of Daikin air conditioner fault codes.

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A to C

A0: External Input Device Error

A1: Malfunction of Indoor Unit PCB

A3: Drain Level Control System

A5: Freeze-up Prevention

A6: Fan Motor Lock

A7: Swing Flap Motor Lock

A9: Electronic Expansion Valve Drive Error

C1: Malfunction of Thermistor (Liquid Pipe)

C2: Malfunction of Thermistor (Gas Pipe)

C3: Malfunction of Thermistor (Room Temperature)

C4: Malfunction of Thermistor (Suction Air Temperature)

C5: Malfunction of Thermistor (Heat Exchanger Temperature)

C9: Malfunction of Thermistor (Discharge Pipe Temperature)

D to H

D3: Malfunction of Air Filter Dirty Detection

E0: EEPROM Parameter Error

E1: Circuit Board Malfunction

E3: High-Pressure Control

E4: Low-Pressure Control

E5: Overheat Control

E6: Faulty Compressor Start

E7: Communication Malfunction

F3: Outdoor Unit Thermistor Error

F6: Refrigerant Overcharge Error

F8: Inverter Overload

H3: Malfunction of Outdoor Unit PCB

H4: Faulty Compressor Motor

H5: Faulty Outdoor Unit Fan Motor

J to M

J3: Faulty Pressure Sensor

J4: Faulty Outdoor Unit Thermistor

J5: Faulty Inverter PCB

J6: Faulty Compressor Sensor

J7: Faulty Outdoor Unit Fan Motor

J9: Faulty Heat Exchanger Temperature Sensor

M1: Malfunction of Centralized Remote Controller

M3: Malfunction of Remote Controller PCB

M4: Faulty Remote Controller Display

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P to U

P0: Faulty Indoor Unit Thermistor

P1: Indoor Unit Capacity Insufficient

P2: Malfunction of Indoor Unit Air Sensor

P3: Faulty Indoor Unit Fan Motor

P4: Faulty Indoor Unit Heat Exchanger Temperature Sensor

P5: Faulty Outdoor Unit Fan Motor

P6: Faulty Outdoor Unit Compressor Motor

P7: Faulty Outdoor Unit Heat Exchanger Temperature Sensor

P8: Faulty Outdoor Unit Thermistor

U0: Low Refrigerant

– U1: System Power Insufficient

U2: Reverse Phase Detection

U4: Short or Open Circuit in Outdoor Unit

U7: Communication Error

U9: EEPROM Error

V to 99

V1: Voltage Error

V3: Inverter Voltage Drop

V4: Inverter Current Drop

V5: Inverter PCB Voltage Drop

V6: Inverter PCB Current Drop

V8: DC Voltage Drop

V9: DC Current Drop

11: Inverter PCB Error

13: Drain Pump Error

14: Malfunction of Radiator Fan Motor

18: Malfunction of 2nd Gas Pipe Thermistor

19: Malfunction of 3rd Gas Pipe Thermistor

22: Malfunction of Air Intake Thermistor

25: Malfunction of Outdoor Unit Heat Exchanger Thermistor

26: Malfunction of 4th Gas Pipe Thermistor

33: Malfunction of Indoor Unit Heat Exchanger Thermistor

39: Malfunction of Inverter Radiator Thermistor

45: Malfunction of Humidity Sensor

48: Malfunction of Air Intake Temp Sensor

49: Malfunction of 2nd Suction Air Thermistor

50: Malfunction of 3rd Suction Air Thermistor

52: Malfunction of 4th Suction Air Thermistor

54: Malfunction of 5th Suction Air Thermistor

55: Malfunction of 6th Suction Air Thermistor

57: Malfunction of 7th Suction Air Thermistor

58: Malfunction of 8th Suction Air Thermistor

59: Malfunction of 9th Suction Air Thermistor

61: Malfunction of Air Intake Fan Motor

63: Malfunction of 2nd Liquid Pipe Thermistor

65: Malfunction of 3rd Liquid Pipe Thermistor

67: Malfunction of 4th Liquid Pipe Thermistor

69: Malfunction of 5th Liquid Pipe Thermistor

71: Malfunction of 6th Liquid Pipe Thermistor

73: Malfunction of 7th Liquid Pipe Thermistor

75: Malfunction of 8th Liquid Pipe Thermistor

77: Malfunction of 9th Liquid Pipe Thermistor

79: Malfunction of 10th Liquid Pipe Thermistor

80: Malfunction of Subcool Heat Exchanger Thermistor

82: Malfunction of 2nd Heat Exchanger Thermistor

84: Malfunction of 3rd Heat Exchanger Thermistor

– 86: Malfunction of 4th Heat Exchanger Thermistor

88: Malfunction of 5th Heat Exchanger Thermistor

– 90: Malfunction of 6th Heat Exchanger Thermistor

92: Malfunction of 7th Heat Exchanger Thermistor

– 94: Malfunction of 8th Heat Exchanger Thermistor

– 96: Malfunction of 9th Heat Exchanger Thermistor

98: Malfunction of 10th Heat Exchanger Thermistor


In conclusion, addressing the Daikin air conditioning not turning on the issue requires a systematic approach. Regular maintenance, timely attention to emerging problems, and professional assistance when necessary are pivotal to ensuring your Daikin AC operates efficiently, providing the cool comfort you expect. Remember to consult the user manual for model-specific instructions and, when in doubt, reach out to Daikin’s customer support or authorized service providers like DGB Refrigeration for comprehensive assistance. By taking a proactive stance on troubleshooting, you can not only revive your AC but also enhance its longevity and overall performance.


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