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Maytag MDBH970 dishwasher - flashing 9  Rate Topic 
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 Posted: Sun May 10th, 2009 03:35 pm
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bryanska
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My Maytag MDBH970AWW is flashing 9 when the unit is not in use. The "rinse only" light is also illuminated during this.

Now, the condition has deteriorated to this -- the flashing 9 sometimes prevents all other keypad entries. To start a cycle I press "auto clean" or "normal wash" and then "start". But the 9 continues to flash

I have scoured the Web and found two possible answers:

1. The most repeated - "replace the board". Why? What specifically is wrong here? A diode or resistor on the board? I know this forum is full of 'root cause' samurai who refuse to take superstition as an answer.

2. It has something to do with the turbidity sensor. What is the turbidity sensor, and is it a part I can swap out?

Any help is appreciated... Let's settle this once and for all!

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 Posted: Mon May 11th, 2009 01:02 am
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Moostafa
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Hello, my rooting friend. We shall need to examine the technician's reference sheet located behind the toe panels on your dishwasher. Therein is written, wiring diagrams, component specifications, and other diagnostically useful information. Your quest begins. Allah be with you. Go.



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 Posted: Mon May 11th, 2009 01:19 am
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bryanska
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I have the manual, and I believe the "thermistor" to be the "turbidity sensor" that I've heard about.

I'll try swapping it, but I'd love to hear a super-informed opinion before I start trialing... something like "yeah, that's a factory code for X".

Seems kinda weird that this problem is all over the Internet and nobody has documented a definite, proven answer. Maybe this will be the first time.

Anyway, yeah I'm going to swap that part. And see what happens. BANZAI!

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 Posted: Mon May 11th, 2009 01:44 am
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bryanska
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Just ran the field service test. If a problem was detected (assuming the machine could detect it), the test would have stopped and a telltale LED would light.

No dice. Field service test did nothing, and the flashing 9 re-appeared a few minutes after it was finished.

This week I will swap the part and report back.

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 Posted: Mon May 11th, 2009 02:22 am
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Moostafa
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Hello, my dicey friend. On this particular model, Maytag made a decision to place all the machine-specific information is in the tech sheet, not the service manuals; the service manual for this model contains only disassembly procedures. So, you already have the only source of detailed information on your dishwasher. If you are having difficulties interpreting or understanding how to use the information contained therein, perhaps you could scan in a copy and upload a PDF version of your technical data sheet.



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 Posted: Mon May 11th, 2009 02:28 am
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bryanska
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Tech sheet at this link:

http://www.servicematters.com/maytag_library/docs/16023222.pdf

Service manual:

http://www.servicematters.com/maytag_library/docs/16021814.pdf



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 Posted: Mon May 11th, 2009 02:35 am
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Moostafa
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Ah, yes, thank Allah, the Compassionate and Merciful, that touchpad pinout resistances are given. This enables you to test the touch pad. Given the nature of the problem you describe, it certainly sounds as though a key pad in the touchpanel is shorted. I advise you to pray to Mecca and proceed on your hajj to appliance paradise by testing the touchpanel key pads.



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 Posted: Mon May 11th, 2009 03:11 am
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bryanska
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OK, I see what you are getting at. The only time the keypad normally flashes a digit, is when you have selected a cycle and the time remaining flashes before you hit "start".

The only cycle that takes 9 minutes is the "rinse only" cycle. So maybe the rinse only button is shorted and creating a false impression that "rinse only" is about to be run?

I tested the leads for the rinse only button. 0 ohms when not pressed. 10k ohms when pressed.

I also checked the "Delay" button, but fine there too.

Should I check the rest? Any further suggestions?

Also, any tips for testing the buttons besides holding the tiny tips of the leads to the tiny black conductive region on the ribbon? I suppose I should really own little alligator clips...

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 Posted: Mon May 11th, 2009 03:17 am
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Moostafa
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In the interest of due diligence, proceed with checking the remaining key pads. The manner of testing that you describe is satisfactory and your readings thus far are reasonable which leads me to conclude that you are testing the key pads in the correct manner. Please proceed. If all key pads test good then, by applying the apophatic method of troubleshooting, we may conclude that the problem is within the control board itself.



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 Posted: Sun May 17th, 2009 03:16 pm
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bryanska
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OK, the other buttons are fine. I am sure the "rinse only" function, however, is wonky. I can't select another cycle unless I press Start REALLY QUICKLY, because then the "rinse only" cycle is immediately selecting itself.

A new control board is $$$...

Any tips on how to disconnect "rinse only" completely?

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 Posted: Sun May 17th, 2009 04:07 pm
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RegUS_PatOff
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looking at the Tech Sheet, it looks like the Touchpad is a switch matrix..

If you have the Front Only controls (not Front & Top)

Rinse Only uses Pins 8 & 9

You could test that "Rinse Only" button to see if it is a bad touchpad...

If you were to disconnect only pin 9 , you would be disabling:


Rinse Only

Heavy Wash

Normal Wash

Light Wash

If you were to disconnect only pin 8, you would be disabling:

Rinse Only


Tough Scrub Plus

Extra Rinse


RepairClinic Part Touchpad prices (depending on the color):
Black $ 161
White $ 70
Bisque $ 61



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