Fujitsu Mini Split Error Code 43: How to Fix It

Q: What causes Fujitsu mini split error code 43?

Error code 43 is caused by a faulty outdoor air temperature sensor. Common causes include sensor damage from weather exposure, loose electrical connections, corrosion, or normal wear after several years of operation.

Q: Can I run my Fujitsu mini split with error code 43?

It's not recommended to run the system with error code 43. The unit may operate inefficiently, consume more energy, or shut down unexpectedly. The outdoor temperature sensor is crucial for proper system operation and efficiency.

Q: How much does it cost to fix error code 43?

A replacement outdoor air temperature sensor typically costs $20-50. If you hire a technician, expect total repair costs of $150-300 including labor. DIY repair can save significant money if you're comfortable with basic electrical work.

Q: How do I prevent error code 43 from happening again?

Keep the outdoor unit clean and free of debris, ensure proper drainage around the unit, and have annual maintenance performed. Protect sensor wires from damage and consider covering the outdoor unit during extreme weather when not in use.

Q: Is error code 43 covered under warranty?

Error code 43 may be covered under warranty if the unit is relatively new and the sensor failed due to manufacturing defects. However, damage from weather, wear, or improper installation typically isn't covered. Check your specific warranty terms.

Abstract

Fujitsu mini split error code 43 indicates a fault with the outdoor air temperature sensor. This sensor helps your system optimize heating and cooling performance by monitoring outside conditions. When it fails, your unit may not operate efficiently or may shut down to protect itself.