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Maytg MDBTT50AW dishwasher not cleaning

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Posted: Wed Jun 25th, 2008 08:37 pm

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lthames
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We're having problems similar to many on this forum and I've followed some of the testing. I did the following . . . .

"*Water level on this unit should be up to the bottom of the heating element (using the element as a face of a clock, use the 9 & 3 positions) when the water shuts off if filling correctly. When the unit is done filling and you get the pause prior to the motor kicking on, look at the float switch on the left hand side behind the kick plate. The float is down to fill and will rise allowing the plunger of the switch to extend and stop the fill. If you are not getting a pause between fill and motor operation, you might not be filling with enough water. If the float is still down, add until it raises and breaks the contacts. Shut the door and start the unit, do the arms now move? If so, could be clogged screens in the valve"

This seems to be the problem, as adding water allowed the cycle to continue and the arms starting moving. But I can't seem to find out what he means by clogged screens in the valve. Is this the same thing as cleaning the mesh filter?

Thanks!!!!!

Lynn

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Posted: Wed Jun 25th, 2008 09:22 pm

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RegUS_PatOff
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the mesh screen in the Water Fill Input Valve

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Posted: Wed Jun 25th, 2008 10:39 pm

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3^rd Post

lthames
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Can you tell me where I would find that in my model?

I've followed the directions in a couple of other threads for Maytags but run into road blocks because the parts don't seem to be the same.

I also found a part diagram on the website but I don't find an input water valve listed . . it only has the major parts.

Thanks for any direction you can give us!

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Posted: Wed Jun 25th, 2008 11:09 pm

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RegUS_PatOff
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click on picture

#2 in diagram

Last edited on Wed Jun 25th, 2008 11:11 pm by RegUS_PatOff

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Posted: Thu Jun 26th, 2008 01:32 pm

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lthames
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ok . . . . I found and disassembled it and the wire mesh filter is clean. I read in another thread that there might be a washer behind it so I pried it out but there was nothing behind that.

Do I have to replace the inlet valve or should I check something with the incoming hose or connections?

Thanks!

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Posted: Thu Jun 26th, 2008 06:24 pm

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6^th Post

RegUS_PatOff
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you could disconnect the output of the valve (hose into a bucket) and see how much water / pressure there is.

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Posted: Thu Jun 26th, 2008 07:50 pm

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Trying to help
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Yow definitely want to test your incoming line pressure as Reg pointed out (minimum 25PSI I believe). The new valve for these units has a greater GPM (Gallons Per Minute) rating to help in low pressure areas.

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Posted: Fri Jun 27th, 2008 08:06 pm

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lthames
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Well . . . the dishwasher is fine (good news, I guess).

The water coming out of the pipe (which T's off the kitchen sink pipe) was just a spary. We temporarily fixed the dishwasher by switching the hoses and using the 'faucet' outlet for the dishwasher. But now the kitchen sink has low water pressure!

So . . . the faucet pipe has great water pressure but the T off of it has low water pressuer. I realize that's not an appliance problem, but if you have any direction on figuring this one out I would really appreciate it!

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Posted: Fri Jun 27th, 2008 09:29 pm

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9^th Post

RegUS_PatOff
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could you post a picture of the pipe & T ?

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Posted: Fri Jun 27th, 2008 10:06 pm

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lthames
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I hope so

Attachment: pipe1.jpg (Downloaded 17 times)

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Posted: Fri Jun 27th, 2008 10:08 pm

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lthames
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but I couldn't figure out how to do it in one reply

Attachment: pipe3.jpg (Downloaded 16 times)

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Posted: Fri Jun 27th, 2008 10:10 pm

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lthames
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The T'd pipe that is pointing down is where the dishwasher WAS hooked up to when it wasn't filling properly.

The hose coming out of the horizontal pipe right next to the cut off knob WAS going to the faucet.

We switched them and the dishwaster is running GREAT . . . but the sink is not

Attachment: pipe2.jpg (Downloaded 17 times)

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Posted: Fri Jun 27th, 2008 10:10 pm

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RegUS_PatOff
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The pressure from the lower shut-off valve is low, even when the top one is not using water ?

the lower shut-off valve may be bad

Last edited on Fri Jun 27th, 2008 10:15 pm by RegUS_PatOff

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Posted: Fri Jun 27th, 2008 10:14 pm

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14^th Post

lthames
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Yes, the bottom one is normally where the dishwasher is hooked up to. It is the one that comes out as a low pressure spay instead of 'full force'

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Posted: Sat Jun 28th, 2008 01:30 am

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Trying to help
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"If you are not getting a pause between fill and motor operation, you might not be filling with enough water. If the float is still down, add until it raises and breaks the contacts. Shut the door and start the unit, do the arms now move? If so, could be clogged screens in the valve"
Glad to see someone listening and researching old posts! :cool:

Great job finding the real problem without having to order in a part!!

Reg has probably hit it on the head. Sounds like the lower shut off valve is either bad or clogged with crap. Anytime a connection comes off a T on the bottom, or any smaller size pipe or fittings are coupled and split in the way shown, the lower end is more susceptible to sucking crap and other matter into it and clogging.

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Posted: Sat Jun 28th, 2008 12:10 pm

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16^th Post

lthames
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Thank you all for your help.

To answer the last question . . . yes, the lower pipe has hardly any pressure (and comes out in a spray) even if the top one is shut off. We even turned the top on off at the valve.

Since it is a plumbing problem, not an appliance problem, I'm calling in plumbing help . . . my brother-in-law is a plumber but not around here! Hopefully he'll be able to help me over the phone.

Again, thanks for all your help.

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Posted: Sat Jun 28th, 2008 12:52 pm

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17^th Post

RegUS_PatOff
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just buy another valve like the one that's bad,

turn off main water supply and replace the valve, that should be threaded onto the copper pipe, but I can't tell from the picture.

Last edited on Sat Jun 28th, 2008 12:54 pm by RegUS_PatOff

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Posted: Sun Jun 29th, 2008 06:12 am

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Budget Appliance Repair
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May not even need a new valve. After turning off water at main, you might want to just take the front off the valve and remove the innerards and see if there is any obvioius blockage. If so clean it out good and check the gasket and reassemble and you may be back in business.

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