Fujitsu Mini-Split Error Code 25: How to Fix It

Q: Can I run my Fujitsu mini-split with error code 25?

No, running the system with low voltage can damage the compressor and other components. Turn off the system and fix the issue.

Q: What causes low voltage in a mini-split?

Common causes include a weak utility power supply, undersized or long wiring, loose connections, a failing capacitor, or an overloaded electrical panel.

Q: How do I check voltage on my mini-split?

Use a multimeter set to AC voltage. Measure between line and neutral at the disconnect box or outdoor unit terminals while the system is off and then under load.

Q: Is error code 25 covered under warranty?

If the issue is due to a defective part (e.g., capacitor) and the unit is within warranty, contact Fujitsu or your installer. Damage due to improper installation or electrical issues may not be covered.

Q: Can I replace the capacitor myself?

Yes, if you have basic electrical skills. Ensure you discharge the capacitor safely and replace it with the exact same rating. If unsure, hire a professional.

Abstract

Error code 25 on your Fujitsu mini-split indicates that the outdoor unit is receiving low voltage. This can cause the system to malfunction or shut down. The problem may be due to a weak power supply, faulty wiring, or a failing capacitor. This guide will help you diagnose and fix the issue safely.