I understand that you are receiving an F8 error code on your Frigidaire air conditioner, model# FASE24C6. I also see that it will work for hours before displaying F8 or sometimes only minutes before displaying the error code. The F8 tells me that there might be a key stuck. I suggest resetting your air conditioner, by unplugging it for 3-5 minutes. Plug your appliance back in and start any cycle. I ask that you please follow up with a comment on the post, at your convenience, to advise if further troubleshooting is needed or if your air conditioner status has changed successfully. Hope this is helpful.