HeatingCodesFujitsu wall-mounted mini-split error codes
Fujitsu indoor units report faults with blinking indicator lamps. A wired remote shows the same fault as a two-character code.
What this table coversCodes from the Wall Mounted table of the Fujitsu General America 410A Mini-Split Troubleshooting Guide (Rev. 5/2019): 9RL2, 9RLS3, 12RL2, 12RLS3, 15RLS3, 18RLB, 24RLB, 30RLXB, 30RLXEH and 36RLXB, including their H and Y variants. Other Fujitsu families and newer R32 models use different tables.
How to read the display
The guide lists three lamps. The Operation lamp flashes a number of times and then the Timer lamp flashes a number of times. In this table the Operation count is the first part of the code and the Timer count is the second, so 1 and 1 is code 11. After 9 the guide uses letters, so 10 Operation flashes and 1 Timer flash is code A1. The Economy lamp is listed as "Continuous".
Almost every row in Fujitsu guide is aimed at technicians (checking thermistor resistance, voltages, connectors and refrigerant). This site lists the meaning of each code and leaves out measurement steps that are not for homeowners.
Fujitsu code table
| Code | Meaning | What the document says |
|---|---|---|
| 11 | Serial communication error (1 / 1). At startup, the evaporator and condenser are not communicating | The guide says to check wiring from the panel to the condenser and condenser to evaporator and to avoid wire nuts and splices. Full explanation |
| 12 | Wired remote controller communication error (1 / 2) | The indoor unit has not received the wired remote signal for more than 1 minute. |
| 18 | External communication error (1 / 8) | |
| 23 | Combination error (2 / 3) | The outdoor unit received a signal that the indoor unit is a multi-zone type. |
| 26 | Address setting error in the wired remote controller system (2 / 6) | |
| 29 | Connection unit number error (2 / 9) | |
| 32 | Indoor unit model information (EEPROM) error (3 / 2) | |
| 35 | Manual/auto switch error (3 / 5) | The manual/auto switch has been on for 60 or more consecutive seconds. |
| 3A | Indoor unit communication circuit (WRC) error (3 / 10) | |
| 41 | Indoor room thermistor error (4 / 1) | |
| 42 | Indoor heat exchanger (pipe) thermistor error (4 / 2) | |
| 51 | Indoor unit fan motor error (5 / 1) | Actual fan frequency is below one-third of target for more than 56 seconds. |
| 58 | Intake grille error (5 / 8) | |
| 62 | Outdoor unit main PCB error (6 / 2) | |
| 63 | Inverter error (6 / 3) | |
| 64 | PFC circuit error or active filter error (6 / 4) | |
| 65 | IPM error (6 / 5) | |
| 71 | Discharge thermistor error (7 / 1) | |
| 72 | Compressor thermistor error (7 / 2) | |
| 73 | Heat exchanger (pipe) thermistor error (7 / 3) | |
| 74 | Outdoor thermistor error (7 / 4) | |
| 77 | Heat sink thermistor error (7 / 7) | |
| 84 | Current sensor error (8 / 4) | |
| 86 | Pressure sensor (high pressure switch) error (8 / 6) | |
| 94 | Over current error (9 / 4) | The guide lists a clogged heat exchanger and a defective condenser fan motor among the causes. |
| 95 | Compressor motor control error (9 / 5) | |
| 97 | Outdoor unit fan motor error (9 / 7) | Outdoor fan motor rotation less than 100 RPM within 20 seconds after it starts. The guide lists a locked motor and high temperature near the motor among causes. |
| 98 | Outdoor unit fan motor 2 error (9 / 8) | |
| 99 | 4-way valve error (9 / 9) | Relates to indoor heat exchanger temperature compared with room temperature in cooling and heating. |
| A1 | Discharge temperature error (10 / 1) | Protection stop when the discharge temperature reaches 230 degrees F (110 C) twice within 24 hours. |
| A3 | Compressor temperature error (10 / 3) | |
| A5 | Low pressure error (10 / 5) |
Source: Fujitsu General America troubleshooting guide, Wall Mounted table. Format: Operation flashes / Timer flashes.
Detailed explanations
SafetyThese tables describe what the manufacturer documents say. Gas, combustion, refrigerant and line-voltage repairs are for licensed professionals. If you smell gas, leave the building and call your gas utility or 911. Safety disclaimer.
Sources
- 410A Mini-Split Troubleshooting Guide, Part # 6-26-FG2020 (Rev. 5/2019), Wall Mounted table (Fujitsu General America (copy hosted by ilovemyfujitsu.com)) Covers: Fujitsu wall-mounted 410A mini-splits listed in the guide (9RL2, 9RLS3, 9RLS3H, 9RLS3Y, 12RL2, 12RLS3, 12RLS3H, 12RLS3Y, 15RLS3, 15RLS3H, 15RLS3Y, 18RLB, 24RLB, 30RLXB, 30RLXEH, 36RLXB). Other Fujitsu families (floor, cassette, multi-zone, newer R32 units) have different tables.