Fujitsu Mini-Split Code A3
Soft lockoutShown as: OPERATION lamp blinks 10 times, TIMER lamp blinks 3 times, ECONOMY lamp blinking continuously
Compressor temperature error. The compressor body reached 226 F (107.8 C) during operation twice within 24 hours and the system stopped to protect it.
Manual wording: “Compressor Temperature Thermistor Error - Protection stop by compressor temperature 226F (107.8C) during compressor operation generated 2 times within 24 hours.”
Documented for: RL2, RLS2, RLS3, RLB/RLXB, RLF, RLF1, RGLX, RLE, LUAS1, LMAS, LZBS, LZAS, LPAS series
Likely causes, most common first
- Closed or partly closed 3-way service valve
- Restricted electronic expansion valve or clogged strainer
- Outdoor fan or heat exchanger not rejecting heat
- Low refrigerant charge or a leak
- Loose connection at the compressor thermistor
What you can safely check yourself
- Clear leaves, snow, and debris from around the outdoor unit and off the coil
- Turn the power off at the disconnect for about 5 minutes, then restore power
When to call a technician
Service valve position, expansion valve, strainer and charge level all require gauges and a refrigeration license. Call a technician.
A Fujitsu mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- 410A Mini-Split Troubleshooting Guide (Part # 6-26-FG2020 Rev. 5/2019) (Fujitsu General America, Inc., All R410A Halcyon mini-splits: RGLX, RL2/RLS3/RLS3H/RLS3Y/RLB/RLXB/RLXEH wall mounted, RLF/RLF1 multi-zone indoor units, RLXFZ multi-zone outdoor units, RML/RMLQ, RULX/RSLX universal-mount, RCLX cassettes) · checked 2026-08-25
- Compressor Temperature Error - Fujitsu General Help Center (Fujitsu General America, Inc., RL2, RLS3, RLS2, RLB/RLXB, RLF, RLF1, LUAS1, LMAS, LZBS, LZAS, LPAS, RGLX, RLE series) · checked 2026-08-25