Daikin Mini Split Error Code E1: How to Fix It

Hard 1-2 hours (diagnosis only; replacement by pro recommended) High Severity Verified June 2026
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Error Code
E1
Brand
Daikin
Product Type
mini_split
Severity
High
DIY Difficulty
Hard
Estimated Fix Time
1-2 hours (diagnosis only; replacement by pro recommended)
Error code E1 on your Daikin mini split indicates a defect in the outdoor unit's printed circuit board (PCB). This is a serious issue that can prevent your system from cooling or heating. You can perform basic checks before calling a technician, but PCB replacement requires professional service.
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Tools You'll Need

How to Fix Error Code E1

  1. Turn Off Power and Safety Check

    Always disconnect power before inspecting the outdoor unit. High voltage capacitors can hold a charge.

  2. Inspect Wiring Connections

    Wear insulated gloves and use tools with insulated handles.

  3. Power Cycle the System

  4. Test the PCB with a Multimeter

    Only attempt if you are experienced with electronics. Risk of shock.

  5. Replace the Outdoor PCB

    Incorrect installation can damage other components or cause electrical hazards.

Parts You May Need

Daikin Outdoor PCB (control board)
Check Price on Amazon
Daikin Outdoor PCB (control board)
Check Price on Amazon
Daikin Outdoor PCB (control board)
Check Price on Amazon
Daikin Outdoor PCB (control board)
Check Price on Amazon
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When to Call a Professional

If basic inspections and power cycling don't fix the error, or if you are not comfortable working with high-voltage electronics, call a licensed HVAC technician. PCB replacement requires exact matching and may involve programming the new board to your system.

Frequently Asked Questions

Can I still use my Daikin mini split with error E1?
No. The system will not operate normally and may shut down completely. Continued use could damage other components.
Is error E1 covered under warranty?
It depends on your warranty terms. Most Daikin units have a 5-10 year parts warranty for the PCB. Contact your installer or Daikin support for a claim.
What causes a PCB defect in Daikin mini splits?
Common causes include power surges, lightning strikes, moisture ingress, overheating, or manufacturing defects.
How much does it cost to replace a Daikin outdoor PCB?
The PCB itself can cost $200-$600 depending on the model. Labor for a professional replacement typically adds $150-$400.

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