Hi. I'm Smitty. I am a professional appliance repair consultant here to help you diagnose, and repair, your appliance.
The F0121 error code is telling you that rthe ice maker is not working. This is most likely due to a plugged filter. Replaceing the filter and then resetting the unit will resolve the problem.
Please see the screeen shots below for the reset procedure.
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Richard, did the reset work?
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