Why won't it operate?

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/

How to Fix a Dishwasher That Won't Start ' Dishwasher Repair

www.partselect.com/Repair/Dishwasher/Will-Not-Start/

If your dishwasher won't start the problem could be the door latch or door latch ... On manual timer models the timer is used to supply power to the pump motor, ...Missing: samsung ‎dmr78ah5

Samsung Dishwasher Won't Start - Model DMR57LFS ...

www.repairclinic.com/...Dishwasher/...-/Samsung-Dishwasher-won-t-start...

The door latch ensures that the dishwasher door latches shut. If the door does notlatch properly, the door switch might prevent the dishwasher from running.

What to Do When the Dishwasher Won't Start - YouTube

? 5:43
https://www.youtube.com/watch?v=L-bMqVb9kX0
Aug 15, 2013 - Uploaded by doityourselfstan
The problem could simply be a blown thermal fuse inside the control panel. ... Maytag Dishwasher Repair ...

The lights that are blinking are indicating an error code--the particular code you describe is a "heater error". You will have to check the circuit for an open heater element, loose or broken wire, defective main control board. The part number for the main board is DE92-02256C. Hope I helped you!

Actually, I think some coffee got down into the base and triggered the flood sensor. (Or it may coincedentally be that your dishwasher has a leak that triggered the flood sensor). You would have to pull the DW out, remove the panel on the left and right-hand sides, and dry all the water (or coffee) out.

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

Eat 200 grams of Cheese!

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.

Does it do this in all setting on the dial, normal,heavy ,delicate?

If three lights are blinking (normal, heavy, quick)... I just had this same problem, and I think I figured it out. There was water on the bottom from the last cycle, so I pressed HEAVY and DELICATE at the same time for 3 seconds (you'll see it printed on the control panel), and the unit drained. I was then able to start the new cycle normally without the error. Hope that helps!

did u replace both boards the machine control and user interface

System Diagnostics
SERVICE MODE
The service mode provides service personnel the
ability to verify the operation of the washing machine.
The service mode can be entered in the middle of
any wash cycle. While in the service mode, the
servicer can start a variety of special service tests.
Accessing Service Mode:
Pressing down the delicates and heavy soil keys for
3 seconds places the machine in the service mode.
Motor speed will be displayed when started. To exit
Service Mode, press delicates and heavy soil keys
for 3 seconds again.
Troubleshooting
December 2004 4 16025861
©2004 Maytag Services
Stage of
Wash Cycle
Advances To
Presoak End of Presoak
Wash Every 5 Minutes of
Wash Time
Spin/Drain Every Step of The
Spin Profile
Rinse End of Rinse
Speed Range Displayed
a) 0-99 rpm 0-99 (actual)
b) 100-999 rpm Speed / 10
Quick Service Cycle
While in service mode, pressing the delicates key
will start a quick service cycle. This will be a quick
check of all systems.
The following steps will be followed.
1. Energize the cold and bleach water valves. Fill to
Low level, then turn bleach and cold off.
2. Energize the hot and fabric softener water valves. Fill
to high level, then turn all valves off.
3. Lock the door.
4. Tumble using 7/3 tumble pattern for 12 sec.
5. Turn the drain on.
6. Spin to 800 RPM using default rates.
7. End spin and coast down.
8. Unlock the door when the RPM is zero.
9. Display a ‘PA’ (Passed) on continuously for 10 seconds
if no diagnostic codes were logged during this
test.
The up arrow if pressed will advance to the next step.
The right most dot will be turned on as an indication
of failure and stay on until quick service cycle test
has reached the end. Any diagnostic code logged
during this test will result in failure of the test, but will
not necessarily stop the test. While in quick service
cycle, the pressing of the hand wash will suspend
the machine at this step for 30 minutes until the
Hand Wash key is pressed again. All LED’s will
flash on and off while the cycle is suspended, or on
hold.
Motor Drive System
To check the system, check the board for proper
output to the motor control. Performing a board
output test does this. Then perform the Motor
Control Board Output Test.
Motor Control Board Output Test
1. Disconnect power to the washer.
2. Remove the front panel and pull the JP4 Connector
from the motor control board.
The following Quick Spin test steps are as follows:
1) Lock the door.
2) Spin to 350 rpm and hold for 6 seconds.
3) Spin to 550 rpm and hold for 6 seconds.
4) Spin to 600 rpm and hold for 6 seconds.
5) Spin to 650 rpm and hold for 6 seconds.
6) Spin to 800 rpm and hold for 6 seconds.
If the Spin key is pressed again during the Quick Spin
test, the current speed will be held indefinitely. Pressing
the Spin key again will allow the quick test to
proceed as listed above.
When the washer is in the Service Mode, the speed
will be displayed as a two digit number or a letter/
number.
Quick Spin Test
While in service mode, the pressing of spin key shall
start the washer in the quick spin mode.
3. Reconnect the washer power cord to supply
voltage. Make sure the door is closed.
4. Press delicates and heavy soil keys for 3 seconds
to activate Service Mode.
!