Daikin Mini Split Error Code PJ: How to Fix It

Medium 15-30 minutes Medium Severity Verified June 2026
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Error Code
PJ
Brand
Daikin
Product Type
mini_split
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
15-30 minutes
Error code PJ on your Daikin mini split indicates an abnormal capacity setting, meaning the outdoor unit's DIP switches are not properly configured for the connected indoor units. This usually happens after installation, maintenance, or a power surge. The fix involves checking and adjusting the capacity settings on the outdoor unit's PCB using the DIP switches.
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Tools You'll Need

How to Fix Error Code PJ

  1. Turn Off Power

    High voltage inside the outdoor unit. Always disconnect power before opening the unit.

  2. Locate the Outdoor Unit PCB

  3. Check Capacity Setting DIP Switches

  4. Adjust DIP Switches if Incorrect

  5. Power On and Test

  6. Reset the System

Parts You May Need

Daikin Main PCB (if faulty)
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Daikin Main PCB (if faulty)
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Daikin Main PCB (if faulty)
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Daikin Main PCB (if faulty)
Check Price on Amazon
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When to Call a Professional

If adjusting DIP switches and resetting do not clear the error, the PCB may be faulty or the indoor-outdoor wiring mismatch may require professional diagnosis. Call a certified HVAC technician.

Frequently Asked Questions

What does Daikin error code PJ mean?
PJ indicates an abnormal capacity setting. The outdoor unit's DIP switches are not set correctly for the indoor units connected, or there's a mismatch in the system configuration.
How do I fix Daikin error PJ?
Turn off power, open the outdoor unit, locate the DIP switches on the PCB, and adjust them to match the indoor unit capacity as per the installation manual. Then power back on.
Can I run my Daikin mini split with error PJ?
No, the system will not operate normally with this error. It may short-cycle or fail to run at all to protect the compressor.
What if adjusting DIP switches doesn't fix PJ?
Try a full power reset (breaker off for 30 minutes). If still present, check for wiring errors between indoor and outdoor units, or a defective PCB. Professional help may be needed.
Is error PJ dangerous?
Not directly, but it indicates a misconfiguration that could damage the compressor if left uncorrected. Always follow safety precautions when working with electrical components.

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