Washer fills with water and thats it

FL means the door failed to lock
DO means washer door is sensed as being open.

http://www.applianceblog.com/manuals/MaytagNeptunenew.pdf

What Codecame up before? NF for no fill?

What filter? are you talking about the water inlet screen?

Confirm the model number is it an FAV6800A machine?

How handy are you if you have to start troubleshooting the issue?

You have a bad water fill valve. Until you get it fixed shut water valves off at the wall so that you don't have a flood if the fill valve on the machine fails completely. Let me know if there is anything else I can Help you with.
Ken

The washer has tried to fill and could not. Make sure the water faucets are open all the way.
Check for kinked hoses.

See error codes on page 12 of the manual.

NF - No Fill
It means that the Washer does not turn on water valves to fill washer with water.

Try the following steps and the problem should be solved.

1.Is the water turned on?

2.Check inlet hose screens for restriction.

3.Check wire connections in harness leading from machine control board to pressure switch.

4.Check water valve.

5.Check inputs and outputs at machine control board.


Good luck.And please do rate my answer.Thank you.

open the back check the belt also see if u can turn it by hand. if that doesn't help call repair man .

The "nf" code is a "no-fill" fault. This indicates that your washing is not getting water supplied to it, or the pressure isn't substantial enough to complete a fill. You need to, first, make sure the water supply is turned on. Second, if the water IS turned on, and you're still not getting anything to your washer, you may have a fill valve problem. The fill valve is what both your hoses connect to on the back of the machine. It can become clogged with sediment over time (especially, if you have hard water or well water). Turn the water supply off and remove both hoses from the back of the washer. Check both these hose connections for clogs in the filter screens. If they are clear, then more than likely the fill valve has gone bad. I hope this helps you. 

The "nf" code is a "no-fill" fault. This indicates that your washing is not getting water supplied to it, or the pressure isn't substantial enough to complete a fill. You need to, first, make sure the water supply is turned on. Second, if the water IS turned on, and you're still not getting anything to your washer, you may have a fill valve problem. The fill valve is what both your hoses connect to on the back of the machine. It can become clogged with sediment over time (especially, if you have hard water or well water). Turn the water supply off and remove both hoses from the back of the washer. Check both these hose connections for clogs in the filter screens. If they are clear, then more than likely the fill valve has gone bad. I hope this helps you.

Try using the spin only function with some water in. To see if it runs, & to wake up the machine.....