Fujitsu Mini-Split Error Code 28: How to Fix It
Medium 30-60 minutes (excluding professional refrigerant service) High Severity
Verified June 2026
- Error Code
- 28
- Brand
- Fujitsu
- Product Type
- mini_split
- Severity
- High
- DIY Difficulty
- Medium
- Estimated Fix Time
- 30-60 minutes (excluding professional refrigerant service)
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Tools You'll Need
- Screwdriver (Phillips or flathead)
- Garden hose with nozzle
- Coil cleaner spray (optional)
- Multimeter
- Refrigerant manifold gauge set
How to Fix Error Code 28
-
Turn Off Power to the Outdoor Unit
Always disconnect power before touching any electrical components. High voltage capacitors can hold a dangerous charge. -
Inspect for Airflow Blockages
-
Clean the Outdoor Coil
Do not use a pressure washer, as it can bend the coil fins. Avoid getting water on electrical components. -
Check the Fan Operation
Be careful of moving parts when the fan is operating. -
Test Refrigerant Pressures
Refrigerant handling requires EPA certification. Do not attempt to add or remove refrigerant without proper training and equipment.
Parts You May Need
Outdoor fan motor
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Fan capacitor
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Outdoor fan motor
Check Price on Amazon
Fan capacitor
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Outdoor fan motor
Check Price on Amazon
Fan capacitor
Check Price on Amazon
Outdoor fan motor
Check Price on Amazon
Fan capacitor
Check Price on Amazon
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When to Call a Professional
If you have cleaned the coil, ensured good airflow, and the fan is working but the error persists, the issue is likely refrigerant-related or a faulty compressor. Call a licensed HVAC technician to diagnose and repair refrigerant issues or compressor problems. Do not attempt refrigerant work yourself unless you are EPA certified.Frequently Asked Questions
What does error code 28 mean on a Fujitsu mini-split?
Error code 28 indicates the outdoor unit's compressor temperature is too high, often due to poor airflow, dirty coils, low refrigerant, or a faulty fan motor.
Can I reset Fujitsu mini-split error code 28?
Turn off the system at the thermostat and circuit breaker for 10 minutes, then turn it back on. If the error returns, the underlying problem needs to be fixed.
Is error 28 serious on a Fujitsu mini-split?
Yes, it can lead to compressor failure if ignored. Address it promptly to avoid costly repairs.
Why is my Fujitsu mini-split outdoor unit hot?
The outdoor unit will be warm during operation, but excessive heat often indicates restricted airflow, dirty coils, or refrigerant issues. Check for obstructions and clean the coils.
How much does it cost to fix Fujitsu mini-split error code 28?
Costs vary: DIY cleaning is free; fan motor replacement $150-$300; refrigerant service $200-$500; compressor replacement $800-$1500. Always get a quote from a professional.