Fujitsu 15,000 BTU 25 SEER Halcyon Wall-Mount Mini Split with Energy Saving Mode 58 Error Fix: Indoor Coil Sensor or Other Indoor Error

Error code 58 on the Fujitsu 15,000 BTU 25 SEER Halcyon Wall-Mount Mini Split with Energy Saving Mode means: Indoor Coil Sensor or Other Indoor Error. A general indoor unit error has been detected — the specific meaning varies by model generation; may indicate an indoor coil sensor issue, a secondary thermistor fault, or an internal indoor unit malfunction; check all indoor unit sensors and connections; consult the specific model's service manual for the exact meaning of code 58 for that generation

The most successful fix is "Test and Replace Indoor Coil Sensor or Thermistor" (medium difficulty, ~45 minutes). Estimated DIY cost: $10-$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 ("Test and Replace Indoor Coil Sensor or Thermistor") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Needle-nose pliers.

DIY cost: $10-$20. Professional repair typically costs $100-$160. Many homeowners save money by trying the top-ranked community fix first.

The Fujitsu 15,000 BTU 25 SEER Halcyon Wall-Mount Mini Split with Energy Saving Mode 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 58 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, 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, 9,000 BTU 33 SEER Halcyon Wall-Mount Mini Split, WiFi Ready, and 2 more. The fix may vary by model, so check each model's specific page for tailored repair steps.