Mitsubishi MSZ-FS06NA 6,000 BTU Compact Wall-Mount Indoor Unit UA Error Fix: Address / Combination Setting Error

Error code UA on the Mitsubishi MSZ-FS06NA 6,000 BTU Compact Wall-Mount Indoor Unit means: Address / Combination Setting Error. The indoor and outdoor units have an incorrect combination or address configuration. This can occur when: incompatible indoor and outdoor models are connected together, the indoor unit address does not match what the outdoor unit expects, or DIP switches are misconfigured during installation. Verify model compatibility using the Mitsubishi Electric compatibility chart. Check all DIP switch and rotary switch settings against the installation manual.

The most successful fix is "Reprogram or Replace Faulty Address/Combination Control Board" (medium difficulty, ~45 minutes). Estimated DIY cost: $0-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Reprogram or Replace Faulty Address/Combination Control Board") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Service remote or laptop with Mitsubishi software.

DIY cost: $0-$20. Professional repair typically costs $150-$300. Many homeowners save money by trying the top-ranked community fix first.

The Mitsubishi MSZ-FS06NA 6,000 BTU Compact Wall-Mount Indoor Unit has 8 other known error codes, including: E1 (Remote Controller PCB Error), E2 (Remote Controller Signal Receiving Error), E3 (Remote Controller Communication Error), E4 (Indoor Unit PCB Processor Error), E5 (Indoor/Outdoor Communication Error (Legacy)), and 3 more.

Error code UA also appears on 14 other Mitsubishi models: MLZ-KP09NA 9,000 BTU One-Way Ceiling Cassette Indoor Unit, MSZ-EF15NA 15,000 BTU Designer Series (Kirigamine Zen) Wall-Mount Indoor Unit, MSZ-FH12NA 12,000 BTU Hyper-Heat H2i Wall-Mount Indoor Unit, MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit, MSZ-GL12NA 12,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit, MUZ-GL09NA 9,000 BTU Single-Zone Outdoor Unit, and 8 more. The fix may vary by model, so check each model's specific page for tailored repair steps.