My air conditioner fan comes on for a second and goes off

Indoor unit indicator
RUN lamp = 6 time flash
TIMER lamp = Comes on
Outdoor unit indicator (LED5) = Stays off
Description of trouble = Indoor fan motor error (2)
Cause = Defective fan motor, Connector poor connection
Conditions of flashing = When air conditioner is operating and indoor fan motor is turned ON, indoor fan motor speed of 400 rpm or under continued for more than 30 seconds. (Air conditioner stops.)

Good Afternoon Jonathan, thanks for your post!
From the information you have provided the fan on your Frigidaire air conditioner turns off after a few seconds of being on. This could be an issue with your fan motor or control panel. I would suggest performing a reset on your air conditioner. You can do that by unplugging the power cord and pressing the rest button. You should then hear a click and press the test button then plug the air conditioner back in. If that does not correct your issue you may need to have a technician out to your home to perform a proper diagnosis and repair. I hope this information is helpful to you. -Matt

Well if you have it set to coldest position and dose that sounds like low on refrigerant

Sounds like low on charge or internal compressor safety.

There is a shaft on the blower motor that goes in the fan on the fan there is a sat screw see if it is tight

Clean the air filter and the both coils, if they are dirty you would get the same symptoms that you have. If the unit is years old it will need to be done.

When temp reached to thermostat level heatewr only will cut off not the blower. And secondly all thermostat at heat stage will cut off at the end of +2 degree and cut in starting of -2 degree.

E.g; If you keep 30 degree heat it will cut off at 32 and cut in 28 degree.

C7-Split compressor over current. Check condenser. If full of dust, clean it. Check rpm of fan motor. If less rpm replace capacitor.

unit likely low on freon cutting out on low pressure switch.

Air conditioner probably has a failed run capacitor inside the unit. Check all circuit breakers and/or fuses first.