Washing machine wont drain properly starts as normal then after10 /20 seconds main light just keeps flashing and machine wont respond to anything and has to be turned off at mains

Many machines have a Timer Mode that allows you to set machine to wash overnight or early in the morning to take advantage of cheaper electricity. Normally when set, the start button flashes.

Try pulling the mains plug on it for an hour to reset it. You can also try holding the Start button pressed for about 6 seconds.

Or

https://readytodiy.com/maytag-washer-sensing-light-blinking-0051/#:~:text=Maytag%20Washer%20Sensing%20Light%20Flashing%3A%20Causes%2FHow%20to%20Fix&text=If%20the%20sensor%20light%20on,a%20shifter%20or%20shift%20actuator.

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Cycle light flashes, but machine wont start - Kenmore Elite ...

https://www.ifixit.com/.../Cycle+light+flashes,+but+machine+wont+...
iFixitThe Kenmore Elite HE3 is a washing machine by Kenmore. ... Whatever cycle I choose, the light just flashes and holding the start button ... I don't seem to have a black pin....the normal wash button just keeps flashing and won't let me start or .

The good ol' Whirlpool Lid Lock Flashing Light Problem - ApplianceBlog

www.applianceblog.com/.../42456-The-good-ol-Whirlpool-Lid-Lock-Fl...
Dec 11, 2013 - 10 posts - ‎3 authors Red Lid Lock light flashing intermittently when you try to start a cycle. ... Mode -- Lid Lock won't work, nor will anything that requires the lid to ... Once the lid has locked the second time, the washer ... shuts down with the lid lock blinking; go back into diagnostic codes and look for shifter or speed sensor errors ...

Cycle light flashes, but machine wont start - Kenmore Elite ...

https://www.ifixit.com/.../Cycle+light+flashes,+but+machine+wont+...
iFixitIf this pin breaks off, the washer will not recognize that the door has be. ... Whatever cycle I choose, the light just flashes and holding the start button does nothing. ... I don't seem to have a black pin....the normal wash button just keeps flashing ...

GE Washer Start button flashing - DoItYourself.com Community Forums

www.doityourself.com/.../386041-ge-washer-start-button-flashing.html
Apr 6, 2009 - GE Washer Start Button flashing will not start Model WPRB8050D1WW, tried holding start button in for 5-10 seconds, did the unplug for 30 ...

the drain pump is probably blocked or overheating, when it starts beeping which lights are flashing reading from right to left e.g. 1,3,5 also what is the model number?

I recomend checking drain hose for kinks or obstructions and checking drain pump. most dishwashers will drain first for about 25/30 seconds.Also check the drain hose into the main plumbing connection it maybe blocked.If it cant drain it wont do anything hope this helps.

Yes.
Child lock active.
Hold start button 10 seconds.
Then it will deactivate.

If this is not the case, door lock fault or main board fault.

Check the height of the drain hose and make sure the drain hose is higher than 30 inches from the ground. If your drain hose drains into the floor you may need to purchase a siphon break to stop the problem

You've put the child lock on! When powered key press the on/off button for 5 seconds. This will remove the key!

Instruction Manual can be found here:
https://portal.bsh-partner.com/portal(bD1kZSZjPTAwOQ==)/PORTALFRAME.HTM

Remove drain hose from where it connects to the plumbing under the sink/tub. Inspect the spigot. If clogged, clean. If clean, then tilt machine back and remove drum to pump hose from pump. Check hose and also drain pump. Clear any obstructions.