Daikin Mini Split Error Code EJ: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
EJ
Brand
Daikin
Product Type
mini_split
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code EJ on your Daikin mini split indicates a field setting abnormality, meaning the system's configuration settings (like DIP switches or remote control parameters) are incorrect or conflicting. This usually happens after installation, a power outage, or when settings are accidentally changed. The error prevents the unit from operating until the settings are corrected.
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Tools You'll Need

How to Fix Error Code EJ

  1. Turn Off Power to the Unit

    Always disconnect power before accessing electrical components. High voltage can cause severe injury or death.

  2. Check DIP Switch Settings on Indoor Unit PCB

    Do not touch other components on the PCB. Static electricity can damage the board.

  3. Reset the System

  4. Check Remote Control Settings

  5. Inspect Wiring Connections

    Recheck polarity — reversed communication wires can damage the control board.

  6. Replace the Indoor Unit PCB (if necessary)

    Only replace PCB if you are experienced with electronics. Improper handling can cause damage.

Parts You May Need

Indoor unit PCB (control board)
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Indoor unit PCB (control board)
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Indoor unit PCB (control board)
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Indoor unit PCB (control board)
Check Price on Amazon
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When to Call a Professional

If you have adjusted DIP switches and remote settings, verified wiring, and the error persists, call a licensed HVAC technician. PCB replacement or complex troubleshooting requires professional expertise.

Frequently Asked Questions

What causes Daikin error code EJ?
EJ means a field setting abnormality — typically incorrect DIP switch positions or remote control settings that conflict with the unit's configuration.
Can I clear the EJ error without a technician?
Yes, if the error is due to incorrect DIP switch or remote settings. Adjust them according to the installation manual, then reset the unit. If the error returns, professional help may be needed.
Why did EJ appear after a power outage?
A power outage can cause the PCB to lose settings or the DIP switches to be accidentally moved. Check and restore your unit's configuration.
Do I need to replace the control board for error EJ?
Only if all settings and wiring are correct and the error persists. A faulty PCB is a less common cause, but possible.
How do I access the DIP switches on a Daikin mini split?
Remove the front panel and locate the control board. DIP switches are small switches (often blue or white) on the board. Refer to your manual for exact location.

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