Error code displayed SY EF. unplugged fridge for 10 minutes, plugged back in, & it worked, started getting colder. It went to normal operating temp. The next morning the error code was back. Unplugged, waited, and plugged back in, worked fine. This afternoon error codes were back. Pulled out back panel of freezer, and the fan is working. Could it still be the fan, or is it the control board?
What is running/not running when it fails?