Daikin Mini Split Error Code FA: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
FA
Brand
Daikin
Product Type
mini_split
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code FA on your Daikin mini split indicates an abnormality with the compressor crankcase heater. This heater warms the compressor when it's off to prevent refrigerant migration. A fault can prevent the heater from operating, risking compressor damage. Follow these steps to diagnose and resolve the issue.
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Tools You'll Need

How to Fix Error Code FA

  1. Turn Off Power and Inspect the Unit

    High voltage inside the unit. Only proceed if you are comfortable with electrical components. If unsure, call a professional.

  2. Check Heater Continuity with a Multimeter

    Ensure power is off and capacitors are discharged before touching any terminals.

  3. Test Power Supply to Heater

    High voltage present. Use insulated probes and avoid touching live parts.

  4. Inspect Control Board and Wiring

  5. Replace Faulty Components

    Use genuine Daikin parts for compatibility and safety.

Parts You May Need

Crankcase Heater
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Control Board (if faulty)
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Crankcase Heater
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Control Board (if faulty)
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Crankcase Heater
Check Price on Amazon
Control Board (if faulty)
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Crankcase Heater
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Control Board (if faulty)
Check Price on Amazon
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When to Call a Professional

If you are not comfortable working with high-voltage electrical components, or if the control board or compressor needs replacement, call a licensed HVAC technician. Also seek professional help if the error persists after replacing the heater or board.

Frequently Asked Questions

Can I run my Daikin mini split with error code FA?
It is not recommended. The crankcase heater protects the compressor. Running without it can cause compressor damage due to liquid refrigerant flooding. Schedule a repair immediately.
What causes the crankcase heater to fail?
Common causes include electrical surges, age-related wear, rodent damage to wires, or a faulty control board not supplying power to the heater.
How much does it cost to fix a crankcase heater?
DIY replacement of the heater part costs around $30-$80. Professional repair, including labor and diagnostics, typically ranges from $150 to $400.
Will error code FA reset itself?
No, the error code will remain until the underlying issue is fixed. You may need to power off the unit for 10 minutes after repair to clear the code.
Is the crankcase heater easy to replace?
It is moderately difficult as it involves accessing the compressor and working with electrical connections. Basic multimeter skills are required. If not confident, hire a professional.

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