Fujitsu 9,000 BTU 33 SEER Halcyon Wall-Mount Mini Split, WiFi Ready EE:EE Error Fix: Communication Error Between Indoor and Outdoor Units

Error code EE:EE on the Fujitsu 9,000 BTU 33 SEER Halcyon Wall-Mount Mini Split, WiFi Ready means: Communication Error Between Indoor and Outdoor Units. The indoor unit display shows EE:EE indicating a complete communication failure between indoor and outdoor units — this is the most visible error as it appears directly on the unit's LED display; check the 3-wire communication cable between units for breaks, loose connections, or corrosion; verify correct wiring polarity (S1, S2, S3); check that the outdoor unit has power; corroded connectors are a common cause, especially in coastal areas; some users report success clearing this error by cycling the breaker, but the underlying wiring issue should be fixed

The most successful fix is "Test and Replace Damaged Communication Cable or Connectors" (medium difficulty, ~60 minutes). Estimated DIY cost: $20-$50. 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 ("Test and Replace Damaged Communication Cable or Connectors") is rated medium difficulty and takes about 60 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Wire strippers, Crimping tool.

DIY cost: $20-$50. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

The Fujitsu 9,000 BTU 33 SEER Halcyon Wall-Mount Mini Split, WiFi Ready has 8 other known error codes, including: 01 (Indoor Unit PCB Error), 02 (Communication Error — Indoor to Outdoor Unit), 03 (Communication Error — Remote Controller to Indoor Unit), 04 (Outdoor Unit PCB Error), 05 (Outdoor DC Fan Motor Open/Short Circuit), and 3 more.

Error code EE:EE also appears on 8 other Fujitsu models: 12,000 BTU 18 SEER Slim Duct Mini Split, 8 in Height, Quiet Operation, 12,000 BTU 25 SEER Halcyon Wall-Mount Mini Split with WiFi Control, 15,000 BTU 25 SEER Halcyon Wall-Mount Mini Split with Energy Saving Mode, 24,000 BTU 19 SEER Wall-Mount Mini Split with Low Ambient Cooling, 36,000 BTU 18 SEER Multi-Zone Heat Pump Outdoor Unit, 48,000 BTU Multi-Zone Heat Pump Outdoor Unit, and 2 more. The fix may vary by model, so check each model's specific page for tailored repair steps.