Refrigerators error codes
Refrigerator codes work differently from other appliances. Most point at sensors, fans, defrost heaters, or the sealed refrigerant system — components that usually need a qualified technician rather than a DIY fix, so we say so plainly.
A few aren't faults at all. Samsung's “OF OF”, for example, is a demo/cooling-off display mode you can switch off in seconds, and we flag those clearly rather than dressing them up as failures. Pick your brand below for the meaning, likely cause, and what to do — including when to stop and call a pro.
LG fridges use “Er” codes (Er FF/IF fans, Er dH defrost, Er CO compressor). Most need a technician. 9 below.
Samsung fridges use digit-letter codes plus the non-fault OF OF display mode. 9 documented below.
Whirlpool fridges surface a smaller set of fault codes and mode indicators. 6 below.