what is the meaning of Fujitsu A4 errors

Fujitsu air conditioners have three lights on the indoor unit - Operation, Timer, and Economy light. The economy light will continuously blink when an error is detected. The number of flashes for the Operation LED and the Timer LED will also indicate the error code A4 detected.
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The E4 code typically means there's a problem with the outdoor temperature sensor or wiring. Inspect the sensor and wiring for damage, clean any debris or corrosion, and make sure all connections are secure. If none of these work, you should call an HVAC professional for help
how to fix E4 errors
E4 errors Kya hota hai
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Message
Action To Be Taken
E1
Check room sensor wiring, Change room sensor, Track/ SMD onPCB in series of room sensor.
E2
Check coil sensor wiring, Change coil sensor, Track/ SMD onPCB in series of coil sensor.
F8
Check coil sensor wiring, Change coil sensor, Track/ SMD onPCB in series of coil sensor.
F6
Check motor wires, Feedback wires, Motor Jam, Track burn/SMD burn in series with feedback signal.
F1
Check room sensor wiring, Change room sensor, Track/ SMD onPCB in series of room sensor.
Green Led blinkalong withoperation LED
Check coil sensor wiring, Change coil sensor, Track/ SMD onPCB in series of coil sensor.
Green Led blinkalong with
operation LED
Check room sensor wiring, Change room sensor, Track/ SMD onPCB in series of room sensor.
Only Green Led
blink after 1 min
Check motor wires, Feedback wires, Motor Jam, Track burn/SMD burn in series with feedback signal.
Fault Message
Action To Be Taken
F8
Check coil sensor wiring, Change coil sensor, Track/ SMD on PCB inseries of coil sensor.
F6
Check motor wires, Feedback wires, Motor Jam, Track burn/ SMDburn in series with feedback signal.
F7
Check room sensor wiring, Change room sensor, Track/ SMD on PCBin series of room sensor.
H6
Check motor wires, Feedback wires, Motor Jam, Track burn/SMD burn in series with feedback signal.
F2
Check coil sensor wiring, Change coil sensor, Track/ SMD onPCB in series of coil sensor.
F1
Check room sensor wiring, Change room sensor, Track/ SMDon PCB in series of room sensor.
C5
Clean & Place connector 04 properly.
E6
Check motor wires, Feedback wires, Motor Jam, Track burn/SMD burn in series with feedback signal.
E2
Check coil sensor wiring, Change coil sensor, Track/ SMD onPCB in series of coil sensor.
E1
Check room sensor wiring, Change room sensor, Track/ SMDon PCB in series of room sensor.and out communication failure
RUN. TIMER-both winking
E0
Outdoor communication failure
RUN. TIMER-both winking
EC
Outdoor sensor
RUN-1 time/8s
E1
Indoor coil temperature sensor
RUN-2 times/8s
E2
Outdoor coil temperature sensor
RUN-3 times/8s
E3
System abnormity
RUN-4 times/8s
E4
Type mismatch
RUN-5 times/85
E5
Indoor fan motor
RUN-6 times/8s
E6
Outdoor temperature sensor
RUN-7 times/Bs
E7
Discharge temperature sensor
RUN-8 times/8s
E8
Invert module abnormity
RUN-9 times/es
E9
Outdoor fan motor (DC)
RUN-10 times/8s
EF
Current sensor
RUN-11 times/8s
EA
EEPROM failure
RUN-12 times/8s
EE
Top of compressor temperature switch
RUN-13 times/8s
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