Error code
Frigidaire refrigerator showing 5Y EF
What it means
Not written, and deliberately not guessed. The layout is here; the meaning is not, because this entry has no confirmed source yet. Fleet rule R5: a search phrase proves that people look for a code, not that the code exists or that it means what the internet says it means. A sister site once published around thirty-eight invented codes that were really symptoms. This page stays unpublished until the brand research pass fills it from the manufacturer's own table.
A code is a lead, not a verdict
The same characters mean different things on different brands, and sometimes on different generations of the same brand. Two things make a code worth acting on: the exact characters, and the model number they came from. Without the second, the first is a guess.
Write the code down before you reset anything, photograph the display rather than transcribing it, and note whether the appliance is still cooling while it shows. That last answer decides whether this waits for a scheduled visit or not.
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Not a refrigerator? Each of these is its own appliance, and has a site of its own.
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