Why is my dishwasher giving three flashing lights on samsung 2012 model and how do i fix it.

A Samsung Dishwasher flashing the Quick light indicates a Water Supply Error (Not Enough Water) has been detected by the internal electronic diagnostics.
https://appliancerepairinfo.com/samsung-dishwasher-quick-light-flashing/

A Samsung Dishwasher flashing the Normal light indicates a Leakage Error has been detected by the internal electronic diagnostics. You can find more info here
https://appliancerepairinfo.com/samsung-dishwasher-normal-light-flashing/

A Samsung Dishwasher flashing the Delicate and Heavy light indicates a Heater Error has been detected by the internal electronic diagnostics. You can find more info here
https://appliancerepairinfo.com/samsung-dishwasher-delicate-and-heavy-light-flashing/

please provide model number of the Dishwasher and the exact keys where the three lights glow.
Perhaps a photo without flash will help

FIXED Kenmore dishwasher lights flashing: "Hi Temp" & "Heat Dry ...

www.applianceblog.com/.../40588-Kenmore-dishwasher-lights-flashing-...

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Why won't my dishwasher start and why does the "Heated Dry"

www.shopyourway.com > Manage My Life > Questions

Nov 16, 2009 - When I hold down the Heated Dry button to turn the control lock on it ...my dishwasher start and why does the "Heated Dry" light keep blinking ...

KITCHENAID DISHWASHER REBOOT - YouTube

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Sep 17, 2012 - Uploaded by DIYAPPLIANCEREPAIR How to reboot your Kitchenaid, Whirlpool, Kenmore by Whirlpool dishwashers control board. ... Up next. Dishwasher Repair will notstart - Repair & Diagnostc - Kitchenaid - Whirlpool ... Kenmore Elite Dishwasher blinking light Control Board FIX - Duration: 1:37. by ... Dishwasher Buttons Not Working?

It depends on what 3 lights are flashing. These lights are a code as to what is wrong, and how to fix it.

If you need further help, reach me via phone at https://www.6ya.com/expert/ronald_e6b9572cebe3ad27

If you have tried to unplug from mains power and there is no difference then you will need to provide the actual model number of your dishwasher in comments field.
The Samsung error codes for Normal, Heavy , Delicate lights stuck is not listed. The closest is Normal, Heavy, Quick which relates to a Low Water level. Also confirm which lights are stuck in your case and whether these are flashing or not.

A Samsung Dishwasher flashing the Heavy Normal and Quick light indicates a Low Water Level Error has been detected by the internal electronic diagnostics.
You can find more info here
https://appliancerepairinfo.com/samsung-dishwasher-heavy-normal-and-quick-light-flashing/

I think you may need to give a bit more information! such as what is the make and model number of your dishwasher and which three lights are flashing.