My portable free standing Maytag AC keeps shutting off and the red exclamation point is lighting up. It is filling up with water, and won't work again until we tip it slightly and pour the water out.

SOURCE: Delonghi Pinguino Classic Portable Air Conditoner Works for 30 min then red light comes on

Have it serviced. It cost me $250 to have a pro do it. Also, check the timer (the dial is hidden by a sliding cover on my unit). My husband cleaned it himself a year later and he took it apart to do it and it works much better now. When he opened it up, it was full of calcium deposit and dust. He told me he did not think the unit had been cleaned properly by the pro.

SOURCE: Maytag Neptune MAH-1 won't stop filling with water

A couple things may be going on here... you may not want to hear, but the Neptune has a had many "consumer related problems".

If your complaint is "will not stop filling with water" I would access your inlet water-valve (typically blue with 2 black battery looking solenoids; where your water-lines connect directly), test for continuity and replace as necessary. Sometimes inlet-water valves also go bad where the complaint is: "no water comes in at all".

SOURCE: Maytag refrigerator ice maker, pouring water out where ice should

change ice maker or check defrost

SOURCE: light like an exclamation point keeps flashing on the dash

It's a warning to "Check Transaxle". A problem was detected and shifting may be limited. Get it looked at soon.

SOURCE: Haier 12,000 portable unit. Red light comes on STOP appears

Drained tank then operated fine