Fujitsu ARU12RLF 12,000 BTU Ceiling Cassette Mini Split, 24 x 24 in, Quiet Operation 26 Error Fix: Outdoor Coil Freeze Prevention Activated

Error code 26 on the Fujitsu ARU12RLF 12,000 BTU Ceiling Cassette Mini Split, 24 x 24 in, Quiet Operation means: Outdoor Coil Freeze Prevention Activated. Ice is forming on the outdoor heat exchanger coil and the freeze protection has activated — during heating mode in cold weather, the outdoor coil acts as an evaporator and can ice up normally, but if the defrost cycle fails to clear the ice, this protection triggers; common causes include a faulty defrost sensor, failed reversing valve (won't switch to defrost mode), low refrigerant, or outdoor fan motor issues reducing airflow across the coil

The most successful fix is "Test and Replace Defrost Sensor or Outdoor Fan Motor" (hard difficulty, ~90 minutes). Estimated DIY cost: $10-$30. 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 Defrost Sensor or Outdoor Fan Motor") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Nut driver set.

DIY cost: $10-$30. Professional repair typically costs $180-$300. Many homeowners save money by trying the top-ranked community fix first.

The Fujitsu ARU12RLF 12,000 BTU Ceiling Cassette Mini Split, 24 x 24 in, Quiet Operation 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 26 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.