Fault Codes Table for Fujitsu Minisplit

Skylar Kaczanowski

Jan 27, 2026

135

Fault Codes Table for Fujitsu Minisplit - Errors Display On Lights Of The Indoor Unit (Operation, Timer, Economy) Or Wired Remote Controller - E: "Error Code"

Error Code	Unit Type	Error Description	Operation LED	Timer LED	Economy LED	Troubleshooting Steps
E: 11	Outdoor	Serial communication error (Serial reverse transfer)	1 Flash	1 Flash	Continuous	Check wiring between indoor and outdoor units; inspect for loose connections. Potential need to replace components
E: 11	Indoor	Serial communication error (Serial forward transfer)	1 Flash	1 Flash	Continuous	Check wiring between indoor and outdoor units; inspect for loose connections. Potential Need to replace components
E: 12	Indoor	Wired remote controller communication error	1 Flash	2 Flashes	Continuous	Verify remote controller wiring; ensure connections are secure. Is remote Compatible?
E: 15	Indoor	Automatic air flow adjustment error	1 Flash	5 Flashes	Continuous	Clean air filters; check fan motor operation. Try again. Otherwise Measure static with manometer and set manually.
E: 18	Indoor	External communication error	1 Flash	8 Flashes	Continuous	Verify communication cable connections; reset the system.
E: 22	Indoor	Indoor unit capacity error	2 Flashes	2 Flashes	Continuous	Confirm correct indoor unit model; check PCB settings. Verify power to all indoor units
E: 23	Outdoor	Combination error	2 Flashes	3 Flashes	Continuous	Confirm compatible unit combinations; inspect wiring connections.
E: 26	Indoor	Address setting error in wired remote controller	2 Flashes	6 Flashes	Continuous	Verify address settings; reset controller.
E: 29	Indoor	Connected unit number error	2 Flashes	9 Flashes	Continuous	Ensure correct unit addressing; confirm total connected units.
E: 32	Indoor	Indoor unit main PCB error	3 Flashes	2 Flashes	Continuous	Inspect PCB for damage; replace if needed.
E: 33	Indoor	Indoor unit motor electricity consumption detection	3 Flashes	3 Flashes	Continuous	Check motor wiring; replace motor if faulty.
E: 35	Indoor	MANUAL AUTO button error	3 Flashes	5 Flashes	Continuous	Inspect control board; replace button if defective.
E: 39	Indoor	Indoor unit power supply error for fan motor	3 Flashes	9 Flashes	Continuous	Check power supply; ensure correct voltage.
E: 3A	Indoor	Indoor unit communication circuit error (wired remote)	3 Flashes	10 Flashes	Continuous	Inspect wiring for damage; verify wiring is correct. reset the system.
E: 41	Indoor	Room temperature sensor error	4 Flashes	1 Flash	Continuous	Replace room temperature sensor.
E: 42	Indoor	Indoor unit heat exchanger sensor error	4 Flashes	2 Flashes	Continuous	Replace heat exchanger sensor.
E: 45	Indoor	Refrigerant leakage sensor error	4 Flashes	5 Flashes	Continuous	Inspect for refrigerant leaks; replace sensor if necessary.
E: 51	Indoor	Indoor unit fan motor error	5 Flashes	1 Flash	Continuous	Inspect fan motor wiring; replace motor if defective.
E: 53	Indoor	Drain pump error	5 Flashes	3 Flashes	Continuous	Clear drain line; inspect pump operation.
E: 62	Outdoor	Outdoor unit model information error	6 Flashes	2 Flashes	Continuous	Verify outdoor unit model settings; check PCB.
E: 63	Outdoor	Inverter error	6 Flashes	3 Flashes	Continuous	Inspect inverter wiring; replace inverter if needed.
E: 64	Outdoor	Active filter voltage error	6 Flashes	4 Flashes	Continuous	Check power supply voltage; inspect wiring.
E: 65	Outdoor	IPM error	6 Flashes	5 Flashes	Continuous	Inspect IPM module; replace if faulty.
E: 71	Outdoor	Discharge thermistor error	7 Flashes	1 Flash	Continuous	Replace discharge thermistor. Verify EEV, Verify Charge
E: 72	Outdoor	Compressor thermistor error	7 Flashes	2 Flashes	Continuous	Replace compressor thermistor. Verify EEV. Verify Charge
E: 73	Outdoor	Outdoor unit heat exchanger thermistor error	7 Flashes	3 Flashes	Continuous	Replace heat exchanger thermistor. Check for Debris on coil
E: 74	Outdoor	Outdoor temperature thermistor error	7 Flashes	4 Flashes	Continuous	Replace outdoor temperature thermistor.
E: 76	Outdoor	2-way valve/3-way valve thermistor error	7 Flashes	6 Flashes	Continuous	Inspect thermistor wiring; ohm out and replace thermistor if needed.
E: 77	Outdoor	Heat sink thermistor error	7 Flashes	7 Flashes	Continuous	Replace heat sink thermistor.
E: 84	Outdoor	Current sensor error	8 Flashes	4 Flashes	Continuous	Inspect current sensor wiring; replace sensor if necessary.
E: 86	Outdoor	High pressure switch error	8 Flashes	6 Flashes	Continuous	Inspect refrigerant pressure; replace switch if needed.
E: 94	Outdoor	Over current error	9 Flashes	4 Flashes	Continuous	Inspect wiring and power supply for overload issues. Verify Compressor and Fan Motor
E: 95	Outdoor	Compressor motor control error	9 Flashes	5 Flashes	Continuous	Inspect Compressor wiring; replace control module if needed. Verify Linesets
E: 97	Outdoor	Outdoor unit fan motor error	9 Flashes	7 Flashes	Continuous	Inspect fan motor wiring; replace motor if defective. Does Fan Spin Freely?
E: 99	Outdoor	4-way valve error	9 Flashes	9 Flashes	Continuous	Inspect valve wiring; replace 4-way valve if faulty.
E: A1	Outdoor	Discharge temperature error	10 Flashes	1 Flash	Continuous	Inspect discharge temperature sensor; replace if defective. Verify Charge

Error Contents	Operation Lamp (Green)	Timer Lamp (Orange)	Economy Lamp (Green)	Wired Remote Display
Communication & Addressing
Serial Communication Error	1 flash	1 flash	Continuous	11
Wired Remote Controller Comm. Error	1 flash	2 flashes	Continuous	12
Unit Number or Refrigerant Circuit Address Error	2 flashes	1 flash	Continuous	21
Address Setting Error (Dual Address Exists)	2 flashes	6 flashes	Continuous	26
Indoor Unit Components
Indoor Unit Capacity Error	2 flashes	2 flashes	Continuous	22
Connecting Number of Indoor Unit Error	2 flashes	4 flashes	Continuous	24
Indoor Unit Model Info Error (EEPROM Access)	3 flashes	2 flashes	Continuous	32
Manual Auto Switch Error	3 flashes	5 flashes	Continuous	35
Indoor Room Thermistor Error	4 flashes	1 flash	Continuous	41
Indoor Heat Exchanger Thermistor Error	4 flashes	2 flashes	Continuous	42
Indoor Unit Fan Motor Error	5 flashes	1 flash	Continuous	51
Drain Pump Error	5 flashes	3 flashes	Continuous	53
Damper Error	5 flashes	7 flashes	Continuous	57
Outdoor Unit & Inverter
Outdoor Unit Model Info Error (EEPROM)	6 flashes	2 flashes	Continuous	62
Inverter Error	6 flashes	3 flashes	Continuous	63
Active Filter Error	6 flashes	4 flashes	Continuous	64
IPM Error	6 flashes	5 flashes	Continuous	65
CT Error	8 flashes	4 flashes	Continuous	84
Over Current Error	9 flashes	4 flashes	Continuous	94
Compressor Control Error	9 flashes	5 flashes	Continuous	95
Outdoor Unit Fan Motor Error	9 flashes	7 flashes	Continuous	97
Sensors & Valves
Discharge Thermistor Error	7 flashes	1 flash	Continuous	71
Compressor Thermistor Error	7 flashes	2 flashes	Continuous	72
Heat Exchanger Thermistor Error (OUT)	7 flashes	3 flashes	Continuous	73
Outdoor Thermistor Error	7 flashes	4 flashes	Continuous	74
2-Way Valve Thermistor Error	7 flashes	6 flashes	Continuous	76
3-Way Valve Thermistor Error	7 flashes	6 flashes	Continuous	76
Discharge Pressure Sensor Error	8 flashes	6 flashes	Continuous	86
4-Way Valve Error	9 flashes	9 flashes	Continuous	99
Coil (Expansion Valve) Error	9 flashes	10 flashes	Continuous	9A
Performance & Temperature
Discharge Temp. Error	10 flashes	1 flash	Continuous	A1
Compressor Temp. Error	10 flashes	3 flashes	Continuous	A3
Poor Refrigerant Circulation	10 flashes	8 flashes	Continuous	A8