CloudStor CLOUDSTOR CS-WV/1D - Manual (Page 48)

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E20 - circuit board error
E21 - internal controller error
E22 - mount error
E23 - hard disk is malfunctioning
LED Information Codes:
The info/error LED will flash amber to give information codes. Like the error codes, these
alternate between flashing for 1 second (tens digit) and 1/2 second (ones digit). Combine the
number of longer flashes with the number of shorter flashes to produce a two digit information
code:
I19 - erasing disk
I23 - initializing system
I25 - updating firmware
I26 - initializing Web configuration
I27 - checking USB disk
I28 - formatting USB disk