Fujitsu Mini-Split Error Code 27: How to Fix It

Hard 1-2 hours (diagnosis only; replacement requires professional) High Severity Verified June 2026
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Error Code
27
Brand
Fujitsu
Product Type
mini_split
Severity
High
DIY Difficulty
Hard
Estimated Fix Time
1-2 hours (diagnosis only; replacement requires professional)
Error code 27 on your Fujitsu mini-split indicates the outdoor unit's compressor is locked (unable to rotate). This is a serious issue often caused by electrical faults, seized bearings, or refrigerant problems. Immediate action is needed to prevent damage to the compressor.
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Tools You'll Need

How to Fix Error Code 27

  1. Safety First: Power Off the System

    High voltage inside the outdoor unit. Even after power off, capacitors can hold a dangerous charge. Use a multimeter to verify zero voltage before touching any components.

  2. Inspect the Compressor for Physical Obstructions

  3. Check the Compressor Capacitor

    Capacitors store electrical energy. Discharge by shorting the terminals with an insulated screwdriver before handling.

  4. Test Compressor Windings

    Only proceed if you have experience with HVAC electrical systems. Incorrect testing can damage the multimeter or cause injury.

  5. Verify Refrigerant Levels

    Refrigerant handling requires EPA certification in many regions. Improper handling can cause frostbite or environmental harm.

  6. Reset the System and Observe

Parts You May Need

Run capacitor (matching microfarad and voltage rating)
Check Price on Amazon
Run capacitor (matching microfarad and voltage rating)
Check Price on Amazon
Run capacitor (matching microfarad and voltage rating)
Check Price on Amazon
Run capacitor (matching microfarad and voltage rating)
Check Price on Amazon
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When to Call a Professional

If the compressor windings test faulty, refrigerant is low, or the error persists after capacitor replacement. Compressor replacement involves specialized tools and refrigerant handling that requires a licensed HVAC technician.

Frequently Asked Questions

Can I fix Fujitsu mini-split error 27 myself?
Basic checks like capacitor testing and visual inspection can be done DIY, but compressor replacement or refrigerant work must be handled by a professional.
What causes compressor lock on a mini-split?
Common causes include a faulty start/run capacitor, seized mechanical bearings, low refrigerant, or electrical issues like shorted windings.
How much does it cost to repair error 27?
Capacitor replacement costs $50–$150 for parts and labor. Compressor replacement can range from $800 to $2,000 depending on labor and refrigerant.
Will error 27 clear itself?
No. The error will persist until the underlying issue is resolved. Simply resetting the power may clear the code temporarily, but it will return if the fault remains.
Is it safe to run the mini-split with error 27?
No. Continued operation can damage the compressor beyond repair. Turn off the system immediately and diagnose the problem.

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