Fujitsu aircon error codes & blinking lights

Search Fujitsu and General residential error codes and blinking lights. Some faults show as OPERATION and TIMER lamp blinks instead of a remote code.

Fujitsu error code & blinking light lookup

Pick your series for the matching rows, or search the code below. For the broader diagnostic walkthrough, see the Fujitsu diagnostic guide.

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Fujitsu aircon error codes & blinking lights

Fujitsu error code & blinking light lookup

OP 1x / TIMER 1xSerial communication error

OP 1x / TIMER 2xWired remote controller communication error or server room control communication error

OP 1x / TIMER 5xCheck run unfinished

OP 1x / TIMER 6xPeripheral unit transmission PCB connection error

OP 1x / TIMER 8xExternal communication error

OP 2x / TIMER 1xUnit number or refrigerant circuit address setting error [Simultaneous Multi]

OP 2x / TIMER 2xIndoor unit capacity error

OP 2x / TIMER 3xCombination error

OP 2x / TIMER 4xConnection unit number error for indoor secondary unit, indoor unit, or branch box

OP 2x / TIMER 6xAddress setting error in wired remote controller system

OP 2x / TIMER 7xPrimary unit, secondary unit setup error [Simultaneous Multi]

OP 3x / TIMER 2xIndoor unit PCB model information error

OP 3x / TIMER 5xManual auto switch error

OP 4x / TIMER 1xRoom temperature sensor error

OP 4x / TIMER 2xIndoor unit heat exchanger middle temperature sensor error

OP 5x / TIMER 1xIndoor unit fan motor 1 error (main fan)

OP 5x / TIMER 3xDrain pump error

OP 5x / TIMER 4xElectric air cleaner reverse VDD error

OP 5x / TIMER 5xFilter set error

OP 5x / TIMER 7xDamper error

OP 5x / TIMER 8xIntake grille error

OP 5x / TIMER 9xIndoor unit fan motor 2 error (left side fan)

OP 5x / TIMER 10xIndoor unit fan motor 3 error (right side fan)

OP 5x / TIMER 15xIndoor unit error

OP 6x / TIMER 2xOutdoor unit main PCB model information error or communication error

OP 6x / TIMER 3xInverter error

OP 6x / TIMER 4xActive filter error, PFC circuit error

OP 6x / TIMER 5xTrip terminal L error

OP 6x / TIMER 8xOutdoor unit rush current limiting resistor temperature rise error

OP 6x / TIMER 10xDisplay PCB microcomputers communication error

OP 7x / TIMER 1xDischarge temperature sensor error

OP 7x / TIMER 2xCompressor temperature sensor error

OP 7x / TIMER 3xOutdoor unit heat exchanger liquid temperature sensor error

OP 7x / TIMER 4xOutdoor temperature sensor error

OP 7x / TIMER 5xSuction gas temperature sensor error

OP 7x / TIMER 6x2-way valve temperature sensor error or 3-way valve temperature sensor error

OP 7x / TIMER 7xHeat sink temperature sensor error

OP 8x / TIMER 2xSub-cool heat exchanger gas inlet temperature sensor error or gas outlet temperature sensor error

OP 8x / TIMER 3xLiquid pipe temperature sensor error

OP 8x / TIMER 4xCurrent sensor error

OP 8x / TIMER 6xDischarge pressure sensor error, suction pressure sensor error, or high pressure switch error

OP 9x / TIMER 4xTrip detection

OP 9x / TIMER 5xCompressor rotor position detection error

OP 9x / TIMER 7xOutdoor unit fan motor error

OP 9x / TIMER 9x4-way valve error

OP 10x / TIMER 1xDischarge temperature error

OP 10x / TIMER 3xCompressor temperature error

OP 10x / TIMER 4xHigh pressure error

OP 10x / TIMER 5xLow pressure error

OP 13x / TIMER 2xBranch boxes error [Flexible Multi]

OP 1x / TIMER 1xSerial communication error

OP 1x / TIMER 2xWired remote controller communication error

OP 1x / TIMER 5xCheck run unfinished or automatic airflow adjustment error

OP 1x / TIMER 6xPeripheral unit transmission PCB connection error

OP 1x / TIMER 8xExternal communication error

OP 2x / TIMER 1xUnit number or refrigerant circuit address setting error [simultaneous multi-split type]

OP 2x / TIMER 2xIndoor unit capacity error

OP 2x / TIMER 3xCombination error

OP 2x / TIMER 4xConnection unit number error for indoor secondary unit, indoor unit, or branch unit

OP 2x / TIMER 6xIndoor unit address setting error

OP 2x / TIMER 7xPrimary unit, secondary unit setup error [simultaneous multi-split type]

OP 2x / TIMER 9xConnection unit number error in wired remote controller system

OP 3x / TIMER 1xPower supply interruption error

OP 3x / TIMER 2xIndoor unit PCB model information error

OP 3x / TIMER 3xIndoor unit motor electricity consumption detection error

OP 3x / TIMER 5xManual auto switch error

OP 3x / TIMER 9xIndoor unit power supply error for fan motor

OP 3x / TIMER 10xIndoor unit communication circuit error for wired remote controller