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

Next step

Choose the next step for E1

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Check during diagnosis

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

note The previous model-independent part specification was removed. Verify the full model number and diagnosis in the manufacturer's official parts catalog before ordering.
part_number None

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: 2026-07-31

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