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Have a Maytag model DWC7400AAW dishwasher and the pressure from the wash arms is weak. hardly enough to make the arms spin. I restricked the water flow through the center washer post and it's at lease spraying further up and ratating slowly. Would this most probably be the impeller? What would you suggest?

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: water not going through spray arms

1.does motor run? no. replace motor. 2.open door and leave the bottom rack inside dw.spin the spray arm underneath the bottom rack by hand. it should spin freely without binding. if it doesnt spin freely take out the bottom rack and try again. if it does spin freely then your bottom rack is laying on your sprayarm preventing it from rotating. 3.you could also not be getting enough water into your dw.

Posted on Mar 22, 2007

catriver
  • 878 Answers

SOURCE: small plastic top and mid spray arm do not turn, bottom does

decrete, you want to get down to the chopper and screen. If the screen is plugged up with gunk there won't be enough pressure to reach the top spray arms. Check out the posted pics. Remove the lower spray arm. Rotate the rear feed arm to the right until it unsnaps from the tube going up the back. See the 4 torq screws holding the filter on. Remove them. Lift the filter up. Now you will see the chopper inlet cover. 1 torq screw holding it in. Lift it up and there's the chopper and screen. Catriver..post back

Posted on Apr 09, 2007

  • 209 Answers

SOURCE: Lower arm spinning slow/intermittent

running with the door open indicates another fault that could be dangerous unless you have bridged the catch for testing only, water should flow fast and forceful at all times that it circulates, through both spray arms at once, you have to look for blockages in the system, is the waste outlet pipe high enough, this allows the machine to fill adequately so it doesn't pump intermittently, i doubt very much this is an electrical problem hope i have helped a little

Posted on Sep 26, 2007

  • 1 Answer

SOURCE: water not going through spray arms

Have same problem except big motor spins independent of stripped? impeller. tried to reassemble but seems mechanical or adhesive agent misssing from one shaft or the other and the motor spins the impeller (now tight) only to have it slip off again and stop pumping water.

Posted on Feb 04, 2008

reg501
  • 413 Answers

SOURCE: Dishwasher spray arms don't spin & spray water

Could be a a couple different issues.. Not filling with enough water or food chopper broke or food chopper filter screen clogged.

Check water level:
Run the DW and wait for the main wash to start (water will fill. pause then complete fill) The water should be no more than 1/4 inch below the heating element. If not there..replace water inlet valve.

Inspect food chopper:
1. Remove lower spray arm and rear water supply tube to upper spray arm.
2. Remove torx screws that secure the sump cover.
3. Remove primary filter
4. Remove food chopper cover to expose the chopper assembly. Inspect for breakage or blockage.

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If you need further assistance, let me know
Regards,
reg501

Posted on Jun 29, 2008

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LG Dishwasher water flow is weak coming out of the lower spray arm. No water coming out of the upper spray arm. I changed the water inlet valve, and there isn't any difference.


There is a possibility the water pressure itself is low from the kitchen line or the dishwasher is set at incorrect water pressure setting and does not collect enough water based on the flow time of inlet valve. If you hear the wash motor cut in then there is not enough water in the base to start pumping it to through the arms.

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How to repair or fix a Dishwasher if it doesn't wash well


A common cause of poor washing results is improper loading—dishes that block or impede the spray arm(s) or prevent the soap dispenser from opening. On the other hand, if your dishwasher has chronic problems with good washing, the problem may not be your dishwasher. A good first step is vary the amount of dishwasher detergent you're using and try switching brands.

Other possibilities: Your home’s water pressure may be too low, your water may be too hard, or the water temperature may not be hot enough.
In order for your dishwasher to fill to the appropriate level, water pressure should be from 20–120 pounds per square inch. If you suspect that your water pressure may be low, turn off all faucets or other users of water (such as washing machines and sprinklers) and then put a half-gallon jug under the kitchen faucet. Turn on the hot water full-blast. If the jug doesn’t fill within 14 seconds, your water pressure may be too low for proper dishwasher operation. Call your city water utility to discuss your options, or avoid drawing water elsewhere in the house or yard during dishwasher cycles.
The right amount of detergent to use depends on how large your load of dishes is and how hard your water is. Hardness is measured in grains of minerals—the more grains per gallon you have, the more detergent you’ll need. If your water has 12 grains or more of hardness, fill both dishwasher soap cups completely with detergent. If that doesn’t work, consider installing a water softener.
To check water temperature, hold a meat thermometer under the hot water faucet for two minutes; if it doesn’t register a minimum of 140 degrees F., turn up the temperature dial on your hot water heater. (However, if you have a newer dishwasher that heats the water internally, it isn’t necessary to turn up your hot water heater.)
If your dishwasher has worked fine in the past but suddenly your dishes aren’t clean after the dishwasher completes all cycles, listen to the spray arm(s) spinning inside during the wash cycle. If spinning poorly, wait for the machine to cool down, remove the spray arm(s) by unscrewing the hubcap(s), lifting the arm(s) off, and then cleaning out the spray holes in the spray arm(s) with a stiff piece of wire.

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1 Answer

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what is the model # how mutch water is in the basin?

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your water supply is too low. he watervalve (inlet valve) may be clogged. With insufficent supply you get a low fill and not enough water to fully enage the pump's power.

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Maytag MDB3700AWE bottom wash arm does not move Freely by hand


Yes, the wash arm should spin freely. Recommend that you remove the arms and search for what is stopping it.
In addition to hard water, the ultra-cheap dishwasher powder really does/can leave calcium-like deposits behind. Use brand name powder for 30 days and you will see a difference. Never use gel or tablets in any dishwasher.
Adding a whole-house water softener would eliminate 90 % of your problem. The other 10% will be taken care of by not buying ultra generic powder.

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Top arm not spinning


only the top rack isnt getting clean?
there is a little plastic circle in the middle of the bottom of the upper spray arm. turn it counter clock wise to pull the upper spray arm from the upper rack. make sure that isnt clogged and the spray holes are not clogged. otherwise....

the piece that the bottem spray arm plugs into and runs along the back wall of the tank to the top is called a feed tube. pull the bottom spray arm out. now you can see the part of the feed tube that feeds the upper spray arm water. does it pop out freely and easily? if so then you need a new feed tube, if not then its most likely your not achieving the right water level or your impeller connected to your circulation pump(motor) is clogged not supplying enough water pressure to travel up the feed tube to spin the upper spray arm.

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Normally when you have low water pressure and/or cleaning issues, this an indication of a clog in your main wash pump. You will need to remove the lower spray arm and the coarse screen to get to the main wash pump sump. Inspect the impeller area of the pump. This area is usually where accumulations of debris collect and keep the pump from pulling enough water. Things like orange seeds, lemon seeds, bottle cap liners, chicken bones, and jar labels are just a few of the items I have personally found. Although, dishwashers do a good job at removing most food particles, they are not garbage disposals. I bet you will find a clog in the sump somewhere. Let me know if this helps.

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1 Answer

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Check to see in you have enough water in tank. The dishwasher fills then recirculates this water under pressure. If you have water in tank, listen to see if motor is running or not. If it is, you may have clogged jet holes in the wash arms.

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Dishwasher doesn't wash well.


I have the same/similar problem with the upper arms not rotating. After calling a repairman and having him tell me just how lousy LG is (ok, good for future reference) and charging me $100, he told me that the main motor assy. had to be replaced. He wanted $500 to do it! Ouch!! The dishwasher is 2 years old and I was not about to spend that much cash on it. I dove in to it (not literally) and saw that there is a small valve that rotates allowing water to go to only the bottom arm, top arms or both. That valve wasn't rotating when needed and was stuck allowing water to only go to the bottom arm. I set the valve to allow water to all arms, reassembled the unit and it works perfectly. BTW when I calld the repair shop with that information, all they could do was tell me how foolish it is to buy an expensive dishwasher. Hope this helps someone.

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