Error code is pointing to outdoor fan failure, how can I fix it

What is the error code E8 on Voltas cassette AC unit?

An E8 error usually indicates a fan problem with the indoor or outdoor unit. An E8 error is usually cleared by power cycling both the indoor and outdoor unit by turning power off at the breaker. Be sure to check the indoor air filters are not dirty and blocking air flow from the fan.

Or

https://www.republicworld.com/technology-news/gadgets/voltas-ac-error-codes-list-know-the-meaning-of-all-these-error-codes-right-here.html#:~:text=F8%3A%20This%20error%20code%20shows,with%20the%20outdoor%20DC%20fan.&text=P2%3A%20This%20error%20code%20shows,the%20Compressor%20phase%20current%20protection.

What is the error code F8 on Voltas?

F8: This error code shows up only when there is an issue with the outdoor ambient temperature sensor. F9: This error code shows up only when there is an issue with the outdoor DC fan. P2: This error code shows up only when there is an issue with the Compressor phase current protection.

Mar 24, 2021

Voltas AC Error Codes list: Know the meaning of all these

https://www.google.com/search?q=Voltas+Cassette+A%2FC+2+ton.+blinking+8+times

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Question edited for a lot more clarity.
Question moved from AC Cars, the maker or the AC Cobra!

H7 - Synchronization failure
The AC technician checks the IDU and ODU for compatibility and restores the synchronization.
Aug 19, 2022

Bluestar AC Error Codes List and Fixes - Kitchenarena

The H5 error code in a Blue Star split inverter AC typically indicates that there is a problem with the outdoor unit. The outdoor unit is the part of the air conditioning system that is located outside the building and is responsible for releasing the heat absorbed from the inside of the building to the outside.
There are a few possible causes of the H5 error code:

1. The outdoor unit's compressor might be malfunctioning. The compressor is the most important component of the outdoor unit and is responsible for compressing and circulating the refrigerant.
2. The outdoor unit's fins might be dirty or obstructed. The fins are the thin metal blades that are responsible for releasing the heat absorbed from the inside of the building to the outside. If the fins are dirty or obstructed, the heat exchange process will be impaired, resulting in the H5 error code.
3. The outdoor unit's fan motor might be malfunctioning. The fan motor is responsible for turning the fan blades that circulate the air over the fins. If the fan motor is not functioning properly, the H5 error code will be displayed.

To troubleshoot the H5 error code, you should start by checking the outdoor unit for any visible signs of damage or obstruction. If you do not see any obvious problems, you may need to call a professional HVAC technician to diagnose and repair the issue.

Possible Causes of P6 Mini Split Error Code
Wiring Problem
Faulty IPM Board
Faulty Outdoor Fan Assembly
Compressor Malfunction
Faulty Outdoor PCB Board
A P6 may be caused by wiring mistake, faulty IPM board, faulty outdoor fan, assembly compressor malfunction, and faulty outdoor PCB.
How To Fix or Clear an P6 Mini Split Error Code
Power off the unit and turn off the breaker or disconnect.
Wait 2-3 minutes and power the unit back on.

F5 error code relates to a outdoor fan speed malfunctioning. This can be caused by a faulty outdoor mother board or a defective outdoor fan motor

Error code e11 is a communications error. The causes listed in the manual for the outdoor unit are:
1) Connection failure.
2) External cause
3) Main PCB failure.
4) Active filter module failure.
5) Transistor PCB (IPM) failure.
6) Filter PCB failure
7) Outdoor unit Fan motor failure

For the indoor unit the listed causes are:
1. Connection failure
2. External cause
3. Controller PCB failure

With any luck you will have a wiring problem(loose/broken wire). Unfortunately it is more likely to be the Main PCB. Good luck!

14.2.2 To Make a Diagnosis1 Timer LED starts to blink and the unit automatically stops the operation.
2 Press the CHECK button on the remote control continuously for 5 seconds.
3 "- -" will be displayed on the remote control display.
Note: Display only for "- -" (No signal transmission, no receiving sound and no Power LED blinking)
4 Press the TIMER ? or ? button on the remote control. The code "H00" (no abnormality) will be displayed
and signal will be transmit to the main unit.
5 Each press of the button (? or ?) will increase error code
number and transmit error code signal to the main unit.
6 When the latest abnormality code on the main unit and
code transmitted from the remote control are matched,
Power LED will light up for 30 seconds and a "beep" sound
(continuously for 4 seconds) will be heard. If no codes are
matched, Power LED will light up for 0.5 seconds and no
sound will be heard.
7 The breakdown diagnosis mode will be canceled unless
pressing the CHECK button continuously for 5 seconds or
operating the unit for 30 seconds.
8 The LED will be off if the unit is turned off or the RESET
button on the main unit is pressed.
Diagnosis
display Abnormality / Protection control Abnormality
Judgement Emergency operation Primary location to verify H00 No abnormality detected - Normal operation H11 Indoor / Outdoor abnormal communica
tion > 1 min after starting
operation Indoor fan operation
only • Internal / external cable connections
• Indoor / Outdoor PCB H14 Indoor intake air temperature sensor
abnormality Continue for 5 sec. - • Intake air temperature sensor (detec
tive or disconnected) H15 Outdoor compressor temperature sensor
abnormality Continue for 5 sec. - • Compressor temperature sensor
(detective or disconnected) H16 Outdoor Current Transformer open cir
cuit - - • Outdoor PCB
• IPM (Power transistor) module H19 Indoor fan motor mechanism locked 7 times occurance
continuously - • Indoor PCB
• Fan motor H23 Indoor heat exchanger temperature sen
sor abnormality Continue for 5 sec. O
(Cooling only) • Heat exchanger temperature sensor
(detective or disconnected) H24 Indoor heat exchanger temperature sen
sor 2 abnormality Continue for 5 sec. - • Heat exchanger temperature sensor
(detective or disconnected) H27 Outdoor intake air temperature sensor
abnormality Continue for 5 sec. O • Outdoor temperature sensor (detec
tive or disconnected) H28 Outdoor heat exchanger temperature
sensor abnormality Continue for 5 sec. O • Outdoor heat exchanger temperature
sensor (detective or disconnected) H30 Outdoor discharge air temperature sen
sor abnormality Continue for 5 sec. - • Outdoor temperature sensor (detec
tive or disconnected) H33 Indoor / Outdoor wrong connection - - • Indoor / Outdoor supply voltage H38 Indoor / Outdoor mismatch (brand code) H50 Ventilation motor abnormality 7 times occurance
continuously - • Indoor PCB
• Ventilation motor H51 Nozzle lock abnormality 2 times occurance
continuously - • Nozzle H52 Limit switch abnormality - - • Indoor PCB H97 Outdoor fan motor mechanism locked 2 times occurance
within 30 minutes - • Indoor PCB
• Fan motor H98 Indoor high pressure protection - - • Air filter dirty
• Air circulation short circuit H99 Indoor heat exchanger anti-freezing pro
tection - - • Insufficient refrigerant
• Air filter dirty F11 Cooling / Heating cycle changeover
abnormality 4 times occurance
within 30 minutes - • 4-way valve
• V-coil F90 PFC control 4 times occurance
within 10 minutes - • Voltage at PFC F91 Refrigerantion cycle abnormality 2 times occurance
within 20 minutes - • No refrigerant
(3-way valve is closed) F93 Compressor rotation failure 4 times occurance
within 20 minutes - • Compressor F95 Cool high pressure protection 4 times occurance
within 20 minutes - • Outdoor refrigerant circuit F96 IPM (power transistor) overheating pro
tection 4 times occurance
within 30 minutes - • Excess refrigerant
• Improper heat radiation
• IPM (Power transistor) F97 Outdoor compressor overheating protec
tion 4 times occurance
within 10 minutes - • Insufficient refrigerant
• Compressor F98 Total running current protection 3 times occurance
within 20 minutes - • Excess refrigerant
• Improper heat radiation F99 Outdoor Direct Current (DC) peak detec
tion 7 times occurance
continuously - • Outdoor PCB
• IPM (Power transistor)
• Compressor

Note:
"O" - Frequency measured and fan speed fixed.
The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until "beep" sound heard following by pressing the "CHECK" button at remote controller.
Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors (refer to Error Codes Table) by using remote controller or Auto Switch at indoor unit. However, the remote controller signal receiving sound is changed from one "beep" to four "beep" sounds.

This fault relates to a over current protection,
fault can be a number of things

connection failure (check power and connections)
outdoor fan failure (fan operating?)
outdoor coil dirty (is air passing through coil or is it clogged)
compressor failure (compressor operating?)
pcb and/or inverter PCB failure (is there power at boards or any visual damage)

Split = Outdoor unit fan problem. Check Outdoor fan motor is plugged in, Electrically & Mechanically sound, if not replace motor, otherwise replace PCB. Multi V
= indoor PCB failure. Replace PCB.

Let me informed again if problem persists,.