Daikin Air Conditioner Error A5-00

⚡ Quick Answer: The Daikin air conditioner A5-00 error indicates a communication failure with the compressor due to frost protection being triggered during cooling or... ✅ DIY Fixable

What Does Error A5-00 Mean?

The Daikin air conditioner A5-00 error indicates a communication failure with the compressor due to frost protection being triggered during cooling or high pressure protection in heating mode. This results in the unit stopping operation and displaying a blinking error light. Common symptoms include extremely cold coils, potential frost buildup, and restricted airflow. The error serves to prevent coil freeze-up in cooling mode and to protect the system from high pressure in heating mode.

Common Symptoms:

  • Unit stops operation and displays A5 error (often flashing lights) during cooling
  • Cooler coils feel extremely cold or frost may be present
  • Airflow restriction or reduced airflow from indoor unit

Possible Causes

  • Heat exchanger temperature fell into freezing range during cooling or detected excessively low evaporator temperature (medium)
  • High refrigerant pressure detected (in heating mode) triggering protection (medium)

How to Fix Error A5-00

DIY Fix Check basic airflow and reset

  1. Turn off the air conditioner via remote
  2. Turn off power at breaker or unplug unit for ~1 minute
  3. Ensure indoor unit filters are clean and no obstructions to airflow
  4. Restore power and restart unit to see if error persists

Technician Only Inspect heat exchanger and pressure control components

  1. Measure evaporator and outdoor heat exchanger temperatures during operation
  2. Check refrigerant pressure levels and electronic expansion valve function
  3. Test thermistors on indoor and outdoor heat exchangers for correct resistance
  4. Inspect for airflow blockages, refrigerant charge issues, and high pressure conditions

Parts needed: thermistors, expansion valve, refrigerant system components

🛑 When to Call a Pro:
  • If repeated A5 errors occur after basic filter cleaning and reset
  • If there are signs of frost build-up on coils or abnormal pressure conditions

Technical Specifications

wattage 2000W
component Compressor Control Board
resistance 5-10 ohms
part_number DAIKIN 4B202A
voltage_rating 230V AC

Common Questions

What does A5-00 error mean on daikin air conditioner?

A5-00 indicates a communication failure with the compressor, often due to frost protection or high pressure protection.

Can I fix daikin air conditioner A5-00 error myself?

Yes, check airflow, clean filters, and reset the unit by turning it off for a minute.

How much does it cost to fix A5-00 error?

Repair costs vary by model and region; consult a technician for an estimate.

When should I call a technician for A5-00?

Call a technician if the error persists after cleaning filters or if frost buildup is present.

Sources & References

Data last verified: 2026-07-01

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