Daikin Air Conditioner Error Codes

Complete Daikin Air Conditioner Guide

This guide explains all Daikin Air Conditioner error codes (CH series) with simple troubleshooting steps to help you identify and fix common issues safely before calling a technician.

A1
Indoor PCB Failure
  • Turn off the power supply immediately.
  • Check indoor control board connections.
  • Inspect for burnt or damaged components.
  • Replace PCB if the fault persists.
A3
Drain System Malfunction
  • Check the drain hose for blockage.
  • Clean the condensate pan and drain pipe.
  • Ensure proper water flow from the unit.
  • Remove any debris in the drainage path.
A6
Fan Motor Error
  • Inspect indoor fan motor for obstruction.
  • Check wiring and electrical connectors.
  • Clean dust buildup on fan blades.
  • Replace motor if it is not operational.
C4
Heat Exchanger Sensor Fault
  • Check temperature sensor connection.
  • Inspect sensor for damage or corrosion.
  • Replace thermistor if readings are incorrect.
  • Secure wiring to ensure stable signal.
C7
Louver Motor Failure
  • Check louver movement for obstruction.
  • Inspect motor wiring and gear assembly.
  • Reset system and test swing function.
  • Replace louver motor if it fails to respond.
E1
Outdoor PCB Failure
  • Turn off power before inspection.
  • Check outdoor control board connections.
  • Inspect for burnt or damaged components.
  • Replace PCB if fault continues.
E5
Compressor Overload
  • Allow compressor to cool down.
  • Check refrigerant levels for imbalance.
  • Inspect condenser airflow for blockage.
  • Call a technician if overload persists.
E6
Compressor Startup Failure
  • Check power supply stability.
  • Inspect capacitor and wiring connections.
  • Ensure compressor is not mechanically seized.
  • Request servicing if startup fails repeatedly.
E7
Outdoor Fan Motor Fault
  • Check fan blades for obstruction.
  • Inspect motor wiring connections.
  • Clean dust and debris from fan assembly.
  • Replace motor if defective.
E9
Electronic Expansion Valve Error
  • Check valve control wiring.
  • Inspect refrigerant flow system.
  • Reset system and retest operation.
  • Replace valve if malfunction persists.
U0
Low Refrigerant Pressure
  • Check system for refrigerant leaks.
  • Inspect piping and flare connections.
  • Recharge refrigerant to proper level.
  • Contact HVAC technician if pressure drops again.
U2
Power Supply Voltage Issue
  • Check incoming power voltage stability.
  • Inspect electrical wiring and breakers.
  • Avoid running other high-load appliances.
  • Install voltage stabilizer if needed.
U4
Communication Error
  • Check wiring between indoor and outdoor units.
  • Inspect connectors for looseness or damage.
  • Reset both units simultaneously.
  • Replace communication board if needed.
U5
Freeze Protection Activation
  • Allow unit to thaw before restarting.
  • Check airflow and filter cleanliness.
  • Inspect evaporator coil condition.
  • Ensure proper fan operation.
J3
Discharge Pipe Temperature Fault
  • Check discharge temperature sensor.
  • Inspect refrigerant flow and compressor load.
  • Clean condenser coils.
  • Service system if overheating continues.
J6
Outdoor Heat Exchanger Sensor Error
  • Inspect outdoor thermistor connection.
  • Check sensor resistance values.
  • Replace faulty sensor if needed.
  • Ensure proper wiring insulation.
L4
Inverter Circuit Fault
  • Turn off power immediately.
  • Inspect inverter PCB for damage.
  • Check compressor drive circuit.
  • Replace inverter module if necessary.
H6
Compressor Lock Protection
  • Check compressor for mechanical seizure.
  • Inspect capacitor and start components.
  • Verify voltage supply stability.
  • Replace compressor if locked.
P4
High Pressure Protection
  • Clean condenser coils and filters.
  • Check for blocked airflow.
  • Inspect refrigerant overcharge condition.
  • Reduce system load and restart.
F3
Discharge Temperature Abnormal
  • Check refrigerant charge level.
  • Inspect compressor condition.
  • Ensure proper cooling airflow.
  • Service system if overheating persists.

Frequently Asked Questions


What does DAI-AC01 Device Not Detected mean?
Check power supply, ensure the air conditioner is turned on, verify remote control batteries, and restart the unit.
What does DAI-AC02 No Cooling Output mean?
Check temperature settings, clean air filters, ensure doors and windows are closed, and inspect refrigerant level if needed.
What does DAI-AC03 Weak Airflow mean?
Clean air filters, remove dust buildup, check fan operation, and ensure vents are not blocked.
What does DAI-AC04 Water Leakage mean?
Check drain pipe for blockage, clean condensate tray, ensure proper installation level, and inspect for ice buildup.
What does DAI-AC05 Loud Noise From Unit mean?
Check for loose panels, clean fan blades, remove foreign objects, and inspect motor or compressor if noise continues.
What does DAI-AC06 Unit Not Turning On mean?
Check power supply and circuit breaker, replace remote batteries, ensure wiring is secure, and reset the unit.
What does DAI-AC07 Remote Not Working mean?
Replace remote batteries, ensure no obstruction to IR sensor, clean sensor area, and try manual control.
What does DAI-AC08 AC Turns Off Automatically mean?
Check timer settings, inspect power stability, clean filters to prevent overheating, and reset the system.
What does DAI-AC09 Not Responding to Remote mean?
Replace batteries, check indoor sensor, restart the air conditioner, and ensure compatibility of remote.
What does DAI-AC10 System Reset Required mean?
Turn off the unit, unplug power for 5–10 minutes, restart system, and restore settings.
What does DAI-AC11 Weak Cooling at Night mean?
Check temperature settings, clean filters, ensure proper airflow, and close all doors and windows.
What does DAI-AC12 Bad Smell From Aircon mean?
Clean filters and indoor unit, remove moisture buildup, run fan mode regularly, and check drain line.
What does DAI-AC13 Ice Formation on Unit mean?
Check airflow, clean filters, inspect refrigerant level, and allow unit to defrost before restarting.
What does DAI-AC14 Outdoor Unit Not Working mean?
Check power connection, inspect compressor operation, ensure proper voltage, and call technician if needed.
What does DAI-AC15 Electrical Trip Issue mean?
Check wiring, inspect breaker, avoid overload circuits, and ensure stable power supply.
What does DAI-AC16 Error Display on Unit mean?
Restart unit, check manual for error code, clean filters, and contact service if persistent.
What does DAI-AC17 Air Conditioner Not Blowing Cold Air mean?
Check cooling mode, clean filters, inspect refrigerant level, and ensure compressor is running.
What does DAI-AC18 Strange Odor in Room mean?
Clean indoor unit, replace or clean filters, check drainage system, and run ventilation mode.
What does DAI-AC19 Indoor Unit Not Receiving Signal mean?
Check remote batteries, ensure IR sensor is clean, restart unit, and remove obstacles.
What does DAI-AC20 Maintenance Required mean?
Clean filters, inspect coils, check airflow system, and schedule professional maintenance if needed.
Important: Always disconnect power before performing repairs. Contact a qualified technician if the issue persists.