Daikin Air Conditioner Error E1

⚡ Quick Answer: The Daikin Air Conditioner E1 error signifies a communication failure between the indoor and outdoor units, often caused by a malfunction in the outdo... ✅ DIY Fixable

What Does Error E1 Mean?

The Daikin Air Conditioner E1 error signifies a communication failure between the indoor and outdoor units, often caused by a malfunction in the outdoor unit's PCB or connection issues. When this error occurs, the air conditioner stops operating, displaying the E1 code, which indicates a protective shutdown of the outdoor unit. Common causes include abnormalities in communication wiring, transient voltage fluctuations, or controller failures.

Common Symptoms:

  • Air conditioner stops operation with E1 displayed
  • Communication failure indication between indoor and outdoor units
  • Outdoor unit protective shutdown

Possible Causes

  • Indoor‑to‑outdoor unit communication abnormality (medium)
  • Outdoor unit PCB or controller malfunction (medium)
  • Voltage fluctuation / transient power issues (medium)

How to Fix Error E1

DIY Fix Basic power reset and inspection

  1. Turn off the air conditioner using the remote or power switch.
  2. Turn off the dedicated AC breaker or unplug the unit.
  3. Wait ~1 minute to allow internal capacitors to discharge.
  4. Restore power and attempt restart to see if E1 clears.

Technician Only Inspect communication wiring and outdoor PCB

  1. Disconnect power and open panels to access indoor‑to‑outdoor communication lines.
  2. Visually check connectors and wiring for loose, corroded, or damaged connections.
  3. Test continuity of communication wiring and signals with appropriate tools.
  4. Evaluate the outdoor unit’s PCB for faults and replace if defective.

Parts needed: Communication harness, Outdoor unit PCB/controller

🛑 When to Call a Pro:
  • Error persists after power reset
  • Visible damaged wiring or components
  • Unit does not restart or functions abnormally after basic checks

Technical Specifications

wattage 1500W
component Control Board
resistance 5-10 ohms
part_number DAIKIN PCB123456
voltage_rating 220V AC

Common Questions

What does E1 error mean on Daikin Air Conditioner?

E1 error indicates a communication failure between the indoor and outdoor units, resulting in the air conditioner not operating.

Can I fix Daikin Air Conditioner E1 error myself?

Yes, you can perform a basic power reset by turning off the unit and breaker, then waiting a minute before restarting.

How much does it cost to fix E1 error?

Estimated repair costs range from ¥15,000 to ¥50,000+, depending on the model and parts required.

When should I call a technician for E1?

Call a technician if the error persists after a power reset, if you see damaged wiring, or if the unit does not restart properly.

Sources & References

Data last verified: 2026-07-01

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