It wont drainand f 21 comes on and sd comes on

you will need to look in the manual that came with the machine, there should be a list of fault codes in the back, either that or call the manufacturer, they should to answer your questions, you'll find their contact details in the back of the manual

Its your fault dude because you entered SD card from its back it will come back with the help of pin

You can use any SD card up to 2GB in size, or any SDHC card up to 8GB in size.

You can download the manual from
http://vivitar.com/files_products/21/VC5024%20User%20Manual.pdf

well kind of vague need model. some have a little check valve where the hose goes to the pump which may have something in it. or the pump may be jammed with glass or pits etc etc.

Sd: Suds lock. Detergent overdose. Clean out the soap dispenser. Remove the bottom panel and open the pump drain. F21: Long drain. Possible cause: Clogged filter, clogged/failed pump. Run some loads without detergent then use these amounts:
The correct amount is as follows:

HE: (2) Tablespoons Per Washload

HE 2X (double concentrated) : (1) Tablespoon

HE 3X (triple concentrated): (1) Teaspoon


If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

check if the lock and unlock switche is the one cozing the problem,it might be stuck some where/on somthing, inside the sd, cz mabe u pushed to hard when pluging it, or the sd is not compatable....

That means that the machine is sensing excessive suds. I just got the same message on my Duet today. The problem with mine, however, is that there is an issue with drainage. We emptied the drain filter and are currently trying to get it to work properly. It switched from Sd to F-21 and has repeated F-21 5 times until just now when it continued on in the drain/spin cycle to actually spin the clothes. Will keep you posted...

F21  mean LONG DRAIN if the dreain time ixceeds 8 minutes the water valve turn off. *After 4 minuts the "Sd" error will be do;[;aied tjem 4 minuts later the        F/21 error code woll be displayed. * Press STOP two times to clear the display. 
if this wont work the following mus be done by a technician.
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keep it in a warm place for about a week. No battery, tape and every compartment or flap open  Also blow it with a fan for a day or two and try a hair dryer but, not very hot.

My SD P 50A3-K We unplugged it and now wont come back on to stay...we turn it on then the red lite comes on green flashes on then right back off.....Some times tv will come back on then it shuts it self off....please help thank you