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

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: 2026-07-01

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