Frigidaire fridge model FGUN2642LF6 fridge is not working. Code displays sy and ef, what is wrong

sounds like compressor not coming on

Call a local repair service. Possibly a bad control board that we DIYER's can not change out if we could even get one.

Hello Brian Watkins,

Not seriously able to BEGIN to help without
any MODEL NUMBER... any chance you could
REPOST your question... (comment or EDIT it in?? ).

I have not been doing any answers on this site
due to the MASSIVE SPAM and CYBER ATTACKS
but I thought is was time to TRY

One of my FAVORITE sites for VIDEO procedures...
Give it a look (still requires MODEL NUMBER).

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Unfortunately, the SY EF error can mean a problem with the electronic control board or the fan. Check your wiring. It's possible that the wiring harness isn't fully seated (at the fan in the freezer or the electronic control board) or one of the wires in the harness is broken. If those are okay and the problem persists, then a new control board is needed.

I wish that I had better news for you.

Cindy Wells

look here
code SY EF Google Search

For instructions on getting a new solenoid valve as well as various other parts, check the parts manual for the refrigerator:
Frigidaire refrigerator parts manual

Good Morning Friend,

I understand you are receiving an "SY EF" code on your Frigidaire refrigerator, model# FRS3R5EMB. The "SY EF" code stands for system error with the evaporator fan. This possibly means that there is something going on with your evaporator fan or it could possibly be a false error code. . I suggest resetting your appliance, by either unplugging it or shutting the power off at your home's circuit breaker, for 3-5 minutes. 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 appliances status has changed successfully.

-Best Regards-
WP

Hello Angela Clark - Typically error code SY CF indicates that the refrigerator has detected a communication failure after power up. Contact a professional to move forward accurately. The wiring between the main control board and user interface board will need to be check and diagnose. Depending on the diagnoses the main control board may need replacing.

Hi.

SY: Defective evaporator system. Check evaporator fan, thermostat and heater.

EF: Evaporator Fan defective. Test and eventually replace the evaporator fan.

The problem is likely the evaporator fan. Before replacing the fan test the other parts comprised in the evaporator system.

Here a tip explaining how to test such parts with a similar fridge model: Fridge not cooling. Procedure is more or less the same with your model.

Here parts and diagrams for your model.

Generally you can find parts and diagrams for most appliances using the links listed on this page: Where do I find parts and diagrams for my appliance?

Regards.

Ginko