Hey friend, thank you for your inquiry!
Based off the information you have provided your Frigidaire refrigerator is displaying "5Y CE". I have researched that code and believe it is an error code of "SY CE" which means a communication error after power up. I would recommend resetting your refrigerator and you can do that by disconnecting power from your appliance for ten minutes.
If that does not help correct the issue it could be a faulty main control board or user interface board. I would consult with a technician to come out and provide an accurate diagnosis. I hope this information is helpful. -Matt
I appreciate your post, friend! Based off what you have described your Frigidaire refrigerator's icemaker is making knocking noise. This could be due to your water valve or motor. Since it is difficult to pinpoint the cause of the knocking noise I would suggest having a professional technician out to perform an accurate diagnosis. This will help you avoid any unnecessary part purchases. Good luck. -Matt
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