Fujitsu Mini-Split: 6 Flashes
A Fujitsu mini-split LED pattern starting with 6 flashes matches 5 documented codes: 62, 63, 64, 65, 6A. Watch the full pattern (short vs. long flashes) to tell them apart — all 5 are explained below.
Code 62: Outdoor unit main PCB error
Outdoor unit main PCB error. The outdoor control board failed to access its EEPROM memory after the unit started.
Manual wording: “Outdoor Unit Main PCB Error - Access to EEPROM failed due to some cause after outdoor unit started.”
Documented for: RGLX, RL2/RLS3/RLB/RLXB, RLF/RLF1 outdoor units
Likely causes, most common first
- Voltage drop or poor ground connection at the outdoor unit
- Failed outdoor main PCB
What you can safely check yourself
- Turn the power off at the outdoor disconnect and the breaker for about 5 minutes, then restore power and see whether the code clears
When to call a technician
Fujitsu's own procedure after a reset is to check the supply voltage and ground at the condenser and then replace the main board. That is technician work at line voltage.
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
Code 63: Inverter error
Inverter error. The outdoor main board received an error report from the inverter (transistor) board that drives the compressor.
Manual wording: “Inverter Error - Error information received from the inverter PCB.”
Documented for: RGLX, RL2/RLS3/RLB/RLXB, RLF/RLF1 outdoor units
Likely causes, most common first
- Loose molex connectors on the inverter PCB
- Wiring fault between the power supply, filter PCB and transistor PCB
- Failed transistor PCB
- Failed main PCB or filter PCB
What you can safely check yourself
- Turn the power off at the outdoor disconnect and the breaker for about 5 minutes, then restore power
When to call a technician
The inverter section holds high-voltage DC capacitors that stay charged after power is removed. Never open the outdoor electrical cover; call a licensed technician.
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
Code 64: PFC circuit error or active filter error, depending on model
PFC circuit error or active filter error, depending on model. On 9RLS3/12RLS3 the inverter output DC voltage went above 415 V for over 3 seconds; on 15RLS3, 15RLS3H and 30RLXEH the inverter input DC voltage went above 425 V or below 80 V, or a momentary power interruption occurred at low voltage.
Manual wording: “PFC Circuit Error (9/12RLS3) - When inverter output DC voltage is higher than 415V for over 3 seconds, the compressor stops. If the same operation is repeated 5 times, the compressor stops permanently.”
Documented for: 9RLS3, 12RLS3 (PFC circuit error); 15RLS3, 15RLS3H, 30RLXEH (active filter error); RGLX models (active filter / PFC circuit error)
Likely causes, most common first
- Voltage drop, brownout, or electrical noise on the supply to the indoor or outdoor unit
- Momentary power interruption
- Loose or erroneous connector connection in the outdoor electrical box
- Failed active filter module (ACTPM) or main PCB
What you can safely check yourself
- Note whether the fault followed a power outage, brownout, or generator switchover
- Turn the power off at the outdoor disconnect and the breaker for about 5 minutes, then restore power
When to call a technician
If the compressor repeats this five times it stops permanently. Diagnosing needs live DC measurements in the inverter section, so call a licensed technician.
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
Code 65: IPM
IPM (intelligent power module) error. An abnormal current was detected at the power module driving the compressor, often because heat cannot escape the outdoor unit.
Manual wording: “IPM Error - Abnormal current value at the IPM is detected. Heat radiation is blocked (inlet/outlet).”
Documented for: RGLX, RL2/RLS3/RLB/RLXB, RLF/RLF1 outdoor units
Likely causes, most common first
- Blocked heat radiation at the outdoor unit inlet or outlet
- Dirty or clogged outdoor heat exchanger coil
- Loose connections on the outdoor unit electrical components
- Failed outdoor fan
- Compressor windings out of specification, or a failed IPM
What you can safely check yourself
- Clear leaves, grass clippings, snow, or stored items away from the outdoor unit so air can move freely through the coil and out of the fan
- Make sure nothing has been placed on top of or against the condenser
- Turn the power off at the disconnect and breaker for about 5 minutes, then restore power
When to call a technician
Anything beyond clearing airflow - coil cleaning, checking the fan, or measuring compressor resistance - needs a licensed technician.
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
Code 6A: Display PCB communication error
Display PCB communication error. The display board has received no communication from the I/O board for more than 10 seconds.
Manual wording: “Display P.C.B. Error - Communication not received from I/O PCB for more than 10 seconds.”
Documented for: RLF multi-zone indoor units
Likely causes, most common first
- Loose or erroneous molex plug connection between the display board and the I/O board
- Failed display PCB
What you can safely check yourself
- Turn the power off at the breaker for about 5 minutes and back on to see whether the code clears
When to call a technician
The display board harness is inside the unit. A technician has to reseat or replace it.
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