Daikin Air Conditioner Error UA-00

⚡ Quick Answer: The Daikin air conditioner UA-00 error indicates a communication failure with the compressor, often resulting in the system stopping operation. This e... ✅ DIY Fixable

What Does Error UA-00 Mean?

The Daikin air conditioner UA-00 error indicates a communication failure with the compressor, often resulting in the system stopping operation. This error usually arises from a configuration mismatch between the indoor and outdoor units. Users may notice unusual sounds and a blinking display during this issue. To address this, ensure that the system setup is correct.

Common Symptoms:

  • System stops operation
  • Error displayed on remote or unit diagnostic display
  • Unit refuses to start or operates intermittently

Possible Causes

  • Indoor‑outdoor unit configuration mismatch (medium)
  • Incorrect onsite settings (multi/system configuration) (medium)
  • Control board or wiring issues (low)

How to Fix Error UA-00

DIY Fix Verify basic unit setup and restart

  1. Power off the system via main breaker or unplug (if safe and accessible).
  2. Wait ~1–2 minutes and restore power.
  3. Ensure remote and indoor unit displays are clear and observe if UA‑00 persists.

Technician Only Check system configuration and settings

  1. Verify indoor/outdoor unit compatibility and that the correct number of indoor units is configured in the controller.
  2. Use diagnostic tools or service remote to view full error logs.
  3. Check wiring connections between indoor and outdoor units, NP terminal wiring, and proper multi‑system settings.

Parts needed: Service remote/diagnostic tool, Control board connection harnesses

🛑 When to Call a Pro:
  • If error persists after basic restart
  • If symptoms include unusual noises, burning smell, or unit overheating

Next step

Choose the next step for UA-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.

Based on diagnostic data

Most relevant component to inspect

HVAC Control Board

Controls fan, compressor, sensor, and communication functions in the HVAC unit.

Typical part-only price
$90 - $320
DIY difficulty
Hard
Estimated time
45-120 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.

Find a part that fits my model

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 number required

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.

Find a part that fits my model

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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.

Maintenance supply

Air Conditioner Fin Cleaner

For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.

View maintenance supply
Maintenance supply

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.

Find one that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

Technical Specifications

wattage 3000W
component Compressor Control Board
resistance 5-15 ohms
part_number DAIKIN 4E128A
voltage_rating 230V AC

Common Questions

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

The UA-00 error signals a communication failure with the compressor, often due to a configuration mismatch.

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

Yes, you can verify the unit setup and restart the system to see if the error persists.

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

Repair costs range from ¥8,000 to ¥25,000 in Japan, depending on service call and configuration time.

When should I call a technician for UA-00?

Contact a technician if the error persists after a restart or if you notice unusual noises or overheating.

Sources & References

Data last verified: 2026-07-25

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