Fujitsu Air Conditioners
60 fault codes documented
Red Blinks, Green 12 Pulses, Yellow Off (AUY, ABY & AWY) — Active Filter Module Error
The red LED blinks, the green LED shows 12 pulses, and the yellow LED is off. This indicates an error with the Active Filter Module (AFM), which is part of the power electronics.
Red 2 Pulses, Green Blinks, Yellow Blinks (AUY, ABY & AWY) — Air Sensor Closed Circuit (Short)
The red LED shows 2 pulses, the green LED blinks, and the yellow LED blinks. This indicates a closed circuit (short circuit) condition in the air temperature sensor, which means the sensor is incorrectly connected or damaged.
Red 2 Pulses, Green Blinks, Yellow Off (AUY, ABY & AWY) — Air Sensor Open Circuit
The red LED shows 2 pulses, the green LED blinks, and the yellow LED is off. This indicates an open circuit condition in the air temperature sensor, meaning the sensor is not connected or faulty.
Red Blinks, Green 11 Pulses, Yellow Off (AUY, ABY & AWY) — CT Error (Current Transformer)
The red LED blinks, the green LED shows 11 pulses, and the yellow LED is off. This indicates an error with the Current Transformer (CT), which measures the current flowing through the unit.
Red 5 Pulses, Green Blinks, Yellow Off (AUY, ABY & AWY) — Communication Error
The red LED shows 5 pulses, the green LED blinks, and the yellow LED is off. This indicates a general communication error between the indoor and outdoor units.
Red Blinks, Green 13 Pulses, Yellow Off (AUY, ABY & AWY) — Compressor Error
The red LED blinks, the green LED shows 13 pulses, and the yellow LED is off. This indicates a general error with the compressor in the outdoor unit, a critical component of the refrigeration cycle.
Red 4 Pulses, Green Blinks, Yellow Off (AUY, ABY & AWY) — Drain Problem
The red LED shows 4 pulses, the green LED blinks, and the yellow LED is off. This indicates a problem with the unit's condensate drainage, likely due to a high water level.
E:0 — Indoor Unit to Remote Control Communication Failure
The wired remote control displays 'E:0' (after 'EE:EE' interrogation). This indicates a communication error between the indoor unit and its wired remote controller.
E:01 — Indoor Unit to Outdoor Unit Communication Failure
The wired remote control displays 'E:01' (after 'EE:EE' interrogation). This indicates a communication error between the indoor and outdoor units of the air conditioning system.
Red Blinks, Green 7 Pulses, Yellow Off (AUY, ABY & AWY) — High Discharge or Compressor Temperature
The red LED blinks, the green LED shows 7 pulses, and the yellow LED is off. This indicates that either the compressor discharge temperature or the compressor's internal temperature is too high.
Red Blinks, Green 6 Pulses, Yellow Off (AUY, ABY & AWY) — High Pressure
The red LED blinks, the green LED shows 6 pulses, and the yellow LED is off. This indicates that the air conditioning system is detecting excessively high pressure in the refrigerant circuit.
Red Blinks, Green Blinks, Yellow Off (AUY, ABY & AWY) — Indoor PCB Failure
The red and green LEDs blink, while the yellow LED is off. This indicates a failure of the Printed Circuit Board (PCB) in the indoor unit.
Red Blinks, Green 10 Pulses, Yellow Off (AUY, ABY & AWY) — IPM Error
The red LED blinks, the green LED shows 10 pulses, and the yellow LED is off. This indicates an error with the Intelligent Power Module (IPM), which controls the compressor's inverter.
Red 6 Pulses, Green Blinks, Yellow Off (AUY, ABY & AWY) — Indoor Fan Failure
The red LED shows 6 pulses, the green LED blinks, and the yellow LED is off. This indicates a failure of the indoor unit's fan motor.
Red Blinks, Green 14 Pulses, Yellow Off (AUY, ABY & AWY) — Outdoor Fan Motor Failure
The red LED blinks, the green LED shows 14 pulses, and the yellow LED is off. This indicates a failure of the outdoor unit's fan motor.
Red Blinks, Green Blinks, Yellow Blinks (AUY, ABY & AWY) — Outdoor PCB Failure
All three LEDs (Red, Green, Yellow) are blinking. This indicates a failure of the Printed Circuit Board (PCB) in the outdoor unit.
Red 5 Pulses, Green Blinks, Yellow Blinks (AUY, ABY & AWY) — Outdoor PCB or Wiring Error
The red LED shows 5 pulses, the green LED blinks, and the yellow LED blinks. This indicates a problem specifically with the outdoor unit's PCB or its associated wiring.
Red Blinks, Green 2 Pulses, Yellow Off (AUY, ABY & AWY) — Outdoor Power Connection Failure
The red LED blinks, the green LED shows 2 pulses, and the yellow LED is off. This indicates a problem with the power connection to the outdoor unit.
Red Blinks, Green 4 Pulses, Yellow Off (AUY, ABY & AWY) — Outdoor Unit Air Sensor Failure
The red LED blinks, the green LED shows 4 pulses, and the yellow LED is off. This indicates a failure of the outdoor ambient air temperature sensor.
Red Blinks, Green 4 Pulses, Yellow Blinks (AUY, ABY & AWY) — Outdoor Unit Air Sensor Short Circuit
The red LED blinks, the green LED shows 4 pulses, and the yellow LED blinks. This indicates a short circuit in the outdoor ambient air temperature sensor or its wiring.
Red Blinks, Green 9 Pulses, Yellow Off (AUY, ABY & AWY) — Outdoor Unit Compressor Temperature Sensor Failure
The red LED blinks, the green LED shows 9 pulses, and the yellow LED is off. This indicates a failure of the temperature sensor specifically for the outdoor unit's compressor.
Red Blinks, Green 5 Pulses, Yellow Off (AUY, ABY & AWY) — Outdoor Unit Discharge Sensor Failure
The red LED blinks, the green LED shows 5 pulses, and the yellow LED is off. This indicates a failure of the outdoor unit's discharge temperature sensor.
Red Blinks, Green 5 Pulses, Yellow Blinks (AUY, ABY & AWY) — Outdoor Unit Discharge Sensor Short Circuit
The red LED blinks, the green LED shows 5 pulses, and the yellow LED blinks. This indicates a short circuit in the outdoor unit's discharge temperature sensor or its wiring.
Red Blinks, Green 3 Pulses, Yellow Off (AUY, ABY & AWY) — Outdoor Unit Pipe Sensor Failure
The red LED blinks, the green LED shows 3 pulses, and the yellow LED is off. This indicates a failure of the temperature sensor on the outdoor unit's refrigerant pipe.
Red 3 Pulses, Green Blinks, Yellow Blinks (AUY, ABY & AWY) — Pipe Sensor Closed Circuit (Short)
The red LED shows 3 pulses, the green LED blinks, and the yellow LED blinks. This indicates a closed circuit (short circuit) condition in the pipe temperature sensor, due to incorrect wiring or sensor damage.
Red 3 Pulses, Green Blinks, Yellow Off (AUY, ABY & AWY) — Pipe Sensor Open Circuit
The red LED shows 3 pulses, the green LED blinks, and the yellow LED is off. This indicates an open circuit condition in the pipe temperature sensor, meaning the sensor is either disconnected or faulty.
Red 2 Flashes, Green 2 Flashes (Single System) — Indoor Air Sensor Failure
Both the red and green LED lights on the indoor unit flash two times simultaneously. This signals a fault with the indoor air temperature sensor, which measures the room temperature.
Red 2 Flashes, Green 3 Flashes (Single System) — Indoor Pipe Sensor Failure
The red LED flashes two times and the green LED flashes three times on the indoor unit. This indicates an issue with the indoor pipe sensor, which monitors the temperature of the refrigerant pipe.
Red 2 Flashes, Green 4 Flashes (Single System) — Indoor Heat Exchanger Sensor Error
The red LED flashes two times and the green LED flashes four times on the indoor unit. This error indicates a problem with the sensor located on the indoor heat exchanger.
Red 2 Flashes, Green 6 Flashes (Single System) — Float Switch Operated (Drain Problem)
The red LED flashes two times and the green LED flashes six times on the indoor unit. This indicates that the float switch has been activated, typically due to a high water level in the drain pan.
Red 3 Flashes, Green 2 Flashes (Single System) — Outdoor Discharge Sensor Failure
The red LED flashes three times and the green LED flashes two times on the indoor unit. This indicates a failure with the outdoor unit's discharge temperature sensor.
Red 3 Flashes, Green 3 Flashes (Single System) — Outdoor Pipe Sensor Failure
Both the red and green LED lights on the indoor unit flash three times simultaneously. This indicates a problem with the outdoor unit's pipe temperature sensor.
Red 3 Flashes, Green 4 Flashes (Single System) — Outdoor Air Sensor Failure
The red LED flashes three times and the green LED flashes four times on the indoor unit. This indicates a fault with the outdoor ambient air temperature sensor.
Red 3 Flashes, Green 7 Flashes (Single System) — Heatsink Sensor Error
The red LED flashes three times and the green LED flashes seven times on the indoor unit. This indicates an error with the heatsink temperature sensor, typically located in the outdoor unit's inverter section.
Red 3 Flashes, Green 8 Flashes (Single System) — Compressor Temperature Sensor Failure
The red LED flashes three times and the green LED flashes eight times on the indoor unit. This signals a failure with the compressor temperature sensor in the outdoor unit.
Red 4 Flashes, Green 2 Flashes (Single System) — Forced Auto Switch Welded
The red LED flashes four times and the green LED flashes two times on the indoor unit. This indicates that the forced auto switch (manual operation switch) is stuck in the 'on' or 'welded' position.
Red 4 Flashes, Green 3 Flashes (Single System) — Main Relay Welded
The red LED flashes four times and the green LED flashes three times on the indoor unit. This indicates a problem with the main relay, suggesting it might be stuck in a closed or 'welded' position.
Red 4 Flashes, Green 4 Flashes (Single System) — Power Failure
Both the red and green LED lights on the indoor unit flash four times simultaneously. This indicates a power supply issue to the unit.
Red 4 Flashes, Green 7 Flashes (Single System) — VDD Permanent Stop Protection
The red LED flashes four times and the green LED flashes seven times on the indoor unit. This indicates that the VDD (Voltage Dependent Detector) protection has permanently stopped the unit, likely due to a severe voltage irregularity.
Red 4 Flashes, Green 8 Flashes (Single System) — Reverse VDD Permanent Stop
The red LED flashes four times and the green LED flashes eight times on the indoor unit. This indicates a permanent shutdown due to a reverse VDD (Voltage Dependent Detector) protection, possibly related to incorrect voltage phasing or severe power fluctuations.
Red 5 Flashes, Green 2 Flashes (Single System) — IPM Protection
The red LED flashes five times and the green LED flashes two times on the indoor unit. This indicates that the Intelligent Power Module (IPM) protection circuit has activated, usually due to an internal electrical fault or stress.
Red 5 Flashes, Green 3 Flashes (Single System) — CT Abnormal (Current Transformer Abnormal)
The red LED flashes five times and the green LED flashes three times on the indoor unit. This indicates an abnormal reading from the Current Transformer (CT), suggesting an issue with current measurement.
Red 5 Flashes, Green 5 Flashes (Single System) — Compressor Failure
Both the red and green LED lights on the indoor unit flash five times simultaneously. This is a critical error indicating a failure or malfunction of the compressor in the outdoor unit.
Red 5 Flashes, Green 6 Flashes (Single System) — Outdoor Fan Failure
The red LED flashes five times and the green LED flashes six times on the indoor unit. This indicates a problem with the outdoor unit's fan motor.
Red 6 Flashes, Green 2 Flashes (Single System) — Indoor Fan Motor Locked
The red LED flashes six times and the green LED flashes two times on the indoor unit. This indicates that the indoor fan motor is locked or unable to rotate freely.
Red 6 Flashes, Green 3 Flashes (Single System) — Indoor Fan Motor Rotation Error
The red LED flashes six times and the green LED flashes three times on the indoor unit. This indicates an error with the rotation of the indoor fan motor, meaning it's not spinning at the correct speed or not at all.
Red 7 Flashes, Green 2 Flashes (Single System) — High Discharge Temperature
The red LED flashes seven times and the green LED flashes two times on the indoor unit. This indicates that the discharge temperature of the compressor is excessively high.
Red 7 Flashes, Green 3 Flashes (Single System) — High Pressure
The red LED flashes seven times and the green LED flashes three times on the indoor unit. This indicates that the refrigeration system is operating under excessively high pressure.
Red 7 Flashes, Green 4 Flashes (Single System) — 4-Way Valve Abnormal
The red LED flashes seven times and the green LED flashes four times on the indoor unit. This indicates an abnormality with the 4-way valve, which controls the direction of refrigerant flow for heating and cooling modes.
Red 7 Flashes, Green 5 Flashes (Single System) — Pressure Switch Failure
The red LED flashes seven times and the green LED flashes five times on the indoor unit. This indicates a failure or abnormal reading from the pressure switch, which monitors refrigerant pressure.
Red 7 Flashes, Green 6 Flashes (Single System) — Compressor Temperature Error
The red LED flashes seven times and the green LED flashes six times on the indoor unit. This indicates an error related to the compressor's operating temperature, which is either too high or an incorrect reading.
Red 8 Flashes, Green 2 Flashes (Single System) — Active Filter AFM Fail 1st Time
The red LED flashes eight times and the green LED flashes two times on the indoor unit. This indicates the first occurrence of a failure in the Active Filter Module (AFM).
Red 8 Flashes, Green 3 Flashes (Single System) — Active Filter AFM Fail 2nd Time
The red LED flashes eight times and the green LED flashes three times on the indoor unit. This indicates a second, more persistent failure in the Active Filter Module (AFM).
Red 8 Flashes, Green 4 Flashes (Single System) — PFC Circuit Error
The red LED flashes eight times and the green LED flashes four times on the indoor unit. This indicates an error in the Power Factor Correction (PFC) circuit, which helps ensure efficient power usage.
Red Blinking, Green Blinking (Single System) — PCB Failure
Both the red and green LED lights on the indoor unit are blinking simultaneously. This typically indicates a failure of the main printed circuit board (PCB) within the indoor unit.
Red Off, Green 2 Flashes (Single System) — Reverse Communication Failure at Startup
The green LED light on the indoor unit flashes two times while the red LED is off. This indicates that the reverse communication between the indoor and outdoor units failed when the system first started up.
Red Off, Green 3 Flashes (Single System) — Reverse Communication Failure In Use
The green LED light on the indoor unit flashes three times while the red LED is off. This indicates a failure in the reverse communication between the indoor and outdoor units during normal operation.
Red Off, Green 4 Flashes (Single System) — Forward Communication Failure at Startup
The green LED light on the indoor unit flashes four times while the red LED is off. This indicates that the forward communication between the indoor and outdoor units failed when the system started.
Red Off, Green 5 Flashes (Single System) — Forward Communication Failure In Use
The green LED light on the indoor unit flashes five times while the red LED is off. This indicates a failure in the forward communication between the indoor and outdoor units during ongoing operation.
Red Off, Green 8 Flashes (Single System) — Wired Remote Control Failure
The green LED light on the indoor unit flashes eight times while the red LED is off. This indicates a problem with the wired remote control or its connection to the indoor unit.