Leaky float valve

I would think something is blocking the intake or the pump rotor?

I would suggest to check the information by clicking here if you are planning to DIY.

Hi.
Sounds like a leaky inlet valve. Sometimes they don't seal off completely or the membrane inside it could be torn. Best to replace the whole valve.
Regards Sam

see this steps and fix it. God bless you

Water Inlet Valve

The dishwasher has an electrical water valve called a water inlet valve. If the dishwasher won't fill with water, the water inlet valve might be defective. These valves are not repairable and will have to be replaced.


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Float

The float assembly is normally inside the dishwasher near the door on the floor of the dishwasher. If something gets stuck underneath it and holds the float assembly up, the dishwasher won't fill with water. If the float assembly moves freely up and down, the float switch might be defective.


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Float Switch

The float switch is actuated by the float assembly. It is a protection device designed to prevent the dishwasher from overfilling. If the dishwasher won't fill with water, it may be because this float switch is defective or stuck.


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Water Supply Problem

The dishwasher is connected to the hot water supply from the house. Check to be sure the household water supply valve is turned on. Over time, calcium deposits can build up in the water supply valve or in the small filter screen inside the water inlet valve. The water supply line may need to be removed from the water inlet valve of the dishwasher, then run some water into a bucket to see if there is enough pressure. Be certain to turn off the water before working on the water line.

test this steps and fix it. GOd bless you

Water Inlet Valve

The dishwasher has an electrical water valve called a water inlet valve. If the dishwasher won't fill with water, the water inlet valve might be defective. These valves are not repairable and will have to be replaced.


Enter your model number to see parts for your dishwasher.
Help me find my model number

Float

The float assembly is normally inside the dishwasher near the door on the floor of the dishwasher. If something gets stuck underneath it and holds the float assembly up, the dishwasher won't fill with water. If the float assembly moves freely up and down, the float switch might be defective.


Enter your model number to see parts for your dishwasher.
Help me find my model number

Float Switch

The float switch is actuated by the float assembly. It is a protection device designed to prevent the dishwasher from overfilling. If the dishwasher won't fill with water, it may be because this float switch is defective or stuck.


Enter your model number to see parts for your dishwasher.
Help me find my model number

Water Supply Problem

The dishwasher is connected to the hot water supply from the house. Check to be sure the household water supply valve is turned on. Over time, calcium deposits can build up in the water supply valve or in the small filter screen inside the water inlet valve. The water supply line may need to be removed from the water inlet valve of the dishwasher, then run some water into a bucket to see if there is enough pressure. Be certain to turn off the water before working on the water line.

follow this steps and fix it. God bless you

Water Inlet Valve

The dishwasher has an electrical water valve called a water inlet valve. If the dishwasher won't fill with water, the water inlet valve might be defective. These valves are not repairable and will have to be replaced.


Enter your model number to see parts for your dishwasher.
Help me find my model number

Float

The float assembly is normally inside the dishwasher near the door on the floor of the dishwasher. If something gets stuck underneath it and holds the float assembly up, the dishwasher won't fill with water. If the float assembly moves freely up and down, the float switch might be defective.


Enter your model number to see parts for your dishwasher.
Help me find my model number

Float Switch

The float switch is actuated by the float assembly. It is a protection device designed to prevent the dishwasher from overfilling. If the dishwasher won't fill with water, it may be because this float switch is defective or stuck.


Enter your model number to see parts for your dishwasher.
Help me find my model number

Water Supply Problem

The dishwasher is connected to the hot water supply from the house. Check to be sure the household water supply valve is turned on. Over time, calcium deposits can build up in the water supply valve or in the small filter screen inside the water inlet valve. The water supply line may need to be removed from the water inlet valve of the dishwasher, then run some water into a bucket to see if there is enough pressure. Be certain to turn off the water before working on the water line.

It could either be your float sensing that you have enough water to operate the unit - http://www.searspartsdirect.com/partsdirect/part-number/Maytag-Parts/Dishwasher-Parts/99002628/0026/464/Model-MDB5600AWB/3048/0130000?keySuffixId=NA&productTypeId=0130000&searchModelNumber=MDB5600AWB&subCompDesc=Tub&brandDesc=MAYTAG&modelDesc=MAYTAG-DISHWASHER&blt=11

Or the water inlet valve - http://www.searspartsdirect.com/partsdirect/part-number/Maytag-Parts/Dishwasher-Parts/6-920534/0022/665/Model-MDB5600AWB/3048/0130000?keySuffixId=NA&productTypeId=0130000&searchModelNumber=MDB5600AWB&subCompDesc=Tub&brandDesc=MAYTAG&modelDesc=MAYTAG-DISHWASHER&blt=11

If the motor is operating without water, then I would first check out the float and make sure that something has not gotten under it, making the machine think that it had water, when it doesn't.

The water-inlet valve lets water enter the machine. First Check to see if the valve is getting water. Make sure it’s not clogged. There is a screen on the inside of the valve, this sometimes gets clogged up with debris. Check to see if you get power to valve when unit is put into operation may take a couple minutes to start a fill. If you have power and it’s not clogged up replace the valve .If you have no power to the water inlet valve check float switch. This can be done by checking the continuity. There is a video of this at http://appliancehelponline.com/dishfloatwaterinletvideo.html this will walk you checking the water inlet valve and the float switch. It may be a different model but the testing procedure will be the same. You can also enter your model # for diagrams and illustrations for most models. All parts come with installation instructions.

It is probably a faulty inlet valve. Check the float switch first.

See here how to locate the parts.

See also this advice for repairclininc:

" There's no water entering the machine If there's no water entering your dishwasher, check these:

Water-inlet valve
Float switch
Water-inlet valve The water-inlet valve lets water enter the machine. If this valve is defective, you need to completely replace it. It's usually located behind the lower access panel on the left or right side. It's the device with the main water line (usually copper) from the house, a rubber tube to the dishwasher, and two wires attached to it.

Float switch The float switch is a small electrical switch that's located right below the dishwasher "floor." Above the switch, on the inside of the dishwasher, is a plastic cylinder that floats up as water fills the dishwasher. If this switch is defective, or if the plastic float gets caught or trapped in the raised position, the water can't enter the dishwasher. If the float switch is defective, you need to replace it.
"

Check the float switch.