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
- Turn off the air conditioner via remote
- Turn off power at breaker or unplug unit for ~1 minute
- Ensure indoor unit filters are clean and no obstructions to airflow
- Restore power and restart unit to see if error persists
Technician Only Inspect heat exchanger and pressure control components
- Measure evaporator and outdoor heat exchanger temperatures during operation
- Check refrigerant pressure levels and electronic expansion valve function
- Test thermistors on indoor and outdoor heat exchangers for correct resistance
- Inspect for airflow blockages, refrigerant charge issues, and high pressure conditions
Parts needed: thermistors, expansion valve, refrigerant system components
- 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
Next step
Choose the next step for A5-00
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Thermistor
Measures precise temperature changes and sends resistance feedback to the control board.
- Typical part-only price
- $15 - $35
- DIY difficulty
- Easy
- Estimated time
- 15-30 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Model-compatible Air Conditioner parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
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Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Air Conditioner Fin Cleaner
For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.
Model-Compatible Washable AC Filter
A reusable filter option only where the appliance supports one. Match the full model, dimensions, and filter specification.
Compatibility check required: use the complete appliance model and compare the existing filter, bag, or specification before ordering.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
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: 2026-07-25
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