<<<I went to see the LGWM340 and DLGX3471 (washer-dryer) today.
Both machines have a diagnostics smart icon which you put your phone next to and the machine makes a fax tone when pressed. LG techs hear the sound through your phone receiver. This will determine what parts are required.
Does this feature rely work? Samsung has WIFI connection which seems to make more sense as far as diagnosing the issue.>>>
LGs Smart Diagnostics is an attempt to reduce unnecessary warranty service calls ($$$)
When a customer contacts LG customer service---to request an authorized servicer appointment---the customer may be asked to take their cellphone over to the appliance (at the image/icon of a phone).
The customer service representative will then instruct the customer to initiate the Smart Phone "diagnostics" procedure.
In reality---this is a low-tech feature.
If the washer had displayed an error previously ("LE" for example)---the CSR will be "notified" of this on their computer screen.
In theory---this would give the CSR a "picture" of what might be "wrong" with the appliance---and suggest corrective action to the customer.
I think it's a good concept---helps keep costs down for LG (and other manufacturers using it).