The unit overflows on an inconsistent basis. It

water level sensor --switch -inlet valve failure ----the machine wont advance till water is at level requested so since it doesn't stop filling it wont cycle to wash -----------https://www.manua.ls/sanyo/asw-40ap/manual

top loader machines have a small tube running up to the sensor that fills with water and affects the level settings
check that it is not a problem with the inlet solenoid not shutting of the water
call a service technician

check that the fill valve was installed correctly
adjust the float level so that when full the cistern water level is around 1/2" below the over flow pipe end
what you have now is that the inlet water is not being shut off correctly and the water is still coming in and flowing out of the overflow

If you manually pull up on the float of the fill valve will it then shut off? If it does, most likely your water pressure is too high, should be around 60 psi. More then 80 and it won't shut off. You may need to add a restrictor to the fill valve. Most fluid-master units come with one already installed, you could try one of them.

Rather hard to understand your problem from the wording in the question but what I understand to be the case is that your tub fills up with water and overflows after the cycle is finished. Perhaps overnight water slowly fills the tub. This is due to the water inlet valve not shutting off all the way. The Inlet valve assembly needs to be replaced.

when you first turn the machine on it will go through 2 fill cycles. turn the machine off, and drain the water reservoir. when you turn the machine back on the first fill cycle should fill the reservoir and over flow a little bit. If it does not overflow then you are not getting enough water (change the fill valve). If it does overflow on the first fill cycle, the the machine probably needs acid cleaned. the instructions on acid cleaning are usually on the door. I don't believe the computer board would be your problem here. Hope this helps, CLINT

try turning off the water at the supply after the machine fills up and see if this still happens. Chances are your fill valve isnt shutting off when its supposed to.

You should also check for power to the switch after the unit starts the wash cycle and see if it is still energized. Which would be a sign of a damaged timer unit.

If your unit keeps filling with the power off, it is the water fill solenoid(s). If the machine overflows it is the float switch. Check out partselect.com and put in your model number. It will show a picture of the part and the price.

If you need more help, post another comment.

Thanks,

Tim

This is a fill valve gone out

fill valve may be hanging open and can be very intermitant may be switch but ck valve first start water entering machine shut washer off and notice if valve takes extra time to shut off if it does would suspect valve problem