Maytag - DWU9502AAM Water will not fill in washcycles but will fill in the rinse cycle. Could this still be the float or is it possible the timer is bad?

Check the water level sensor.

What water temp do you wash on and what water temp for rinse?

I had the problem years ago on a Maytag DWU9200. The problem was that a tiny wire was broken on the motor that is running the timer and the timer was not working. I had to replace the complete timer assembly. I got an electrical schematic with the new timer.
This has now worked for 5 years...
Today the float for the float switch was stocked, preventing the water to fill the dishwasher during the cycle. I moved the float up and down several times and it works now.
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SOUNDS LIKE A TIMER PROBLEM. YOU MAY WANT TO PRICE A REPLACEMENT TIMER. AND PRICE OUT NEW DISHWASHERS. GOOD LUCK!

If you need further help, I’m available over the phone at https://www.6ya.com/expert/dude_653d05454b389bba

well the timer and the float are the only two things that control your fill cycle,
so since your float is correct ie the rinse cycle
we can only assume that it would not be intermiten it is just a cherry switch
http://www.appliancepartspros.com/partsearch/model.aspx?model_id=255697&diagram_id=77498#d77498

here is the link to the part (timer)
and the breakdown of how to get at it

you need to replace the water level switch

The control timer is the problem is what I think.

Did you replace the pressure switch its a round plastic thing with a plastic tube at the bottom and six electrical connections

Are you getting cold water to fill ?How is the water pressure?Timer maybe at fault here.

My Maytag MDB6650AWW dishwasher would not fill. The lights on the panel were on when I tried the wash cycle. I tested the water valve but no voltage was found during the cycle. I thought it may be the timer/control circuit. I traced the power from the door switch and found no power going to the float switch leg. I found two wires completely cut through (one going to the Water Valve) and three others partially sliced.