Even though the User Manual for the WD My Cloud has no description or reference to a Orange / Yellow LED … it Definately does Have One. Have seen it several times.
Just tested it now with my 2TB WD My Cloud … if i disconnect the Ethernet Cable connected to it and then wait a few seconds and plug it back in … The Front LED Blnks Orange / Yellow (NOT RED as stated in the My Cloud User Manual) several times and then returns to normal … Blue
The Blinking Orange / Yellow LED Indicates in my Test … “Network Cable Not Inserted”
as described in an older My Book Live/Duo KBA … https://support.wdc.com/knowledgebase/answer.aspx?ID=17771
A Solide Orange / Yellow LED Indicates … “Drive has begun Loading the Operating System (OS)”
I think i recall having a Solid Orange / Yellow LED after an Electrical Storm Blackout … and when the power was restored the Solid Orange / Yello LED took a long time to disappear … can’t recall, but it may have been 10 minutes.
Anyways, just because the My Cloud User Manual does not state the Orange / Yellow LED … does not mean it does not exist.
And i have seen a number of errors and omissions in WD Manuals over the years.
And the User Manual Stating that RED LED is “Attention” Status … is Incorrect.
I have NEVER seen a RED LED in the years i’ve had My My Cloud … just as well, because that’s Severe Fault / Problem.