Fujitsu Mini-Split Code 71
Soft lockoutShown as: OPERATION lamp blinks 7 times, TIMER lamp blinks 1 time, ECONOMY lamp blinking continuously
Discharge thermistor error. The sensor on the compressor discharge pipe read as open or shorted, either at power up or while the compressor was running.
Manual wording: “Discharge Thermistor Error - When discharge pipe temperature thermistor open or short-circuit is detected at power on or while running the compressor.”
Documented for: RGLX, RL2/RLS3/RLB/RLXB, RLF/RLF1 outdoor units
Likely causes, most common first
- Loose, removed, or wrongly landed thermistor connector
- Open or shorted discharge thermistor
- Failed outdoor main PCB
What you can safely check yourself
- Turn the power off at the outdoor disconnect and breaker for about 5 minutes, then restore power
When to call a technician
The discharge thermistor sits on hot refrigerant piping inside the condenser cabinet. Replacing it is a technician's job.
A Fujitsu mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- 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