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maytag quiet series 300 will not start

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All wash type options are available on the control panel display, when I close the door the correct time for

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Old 04-19-2009, 05:26 PM
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Question maytag quiet series 300 will not start
Brand: Maytag   Age: 1 - 5 years   

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All wash type options are available on the control panel display, when I close the door the correct time for the option I chose is displayed, I press start, but the dishwasher never starts. If I press the start button twice a "2" is displayed and the dishwasher drains for 2 minutes. If I just press once (which is normally what is done) the "2H" is displayed (which is correct) but after about 4 or 5 minutes the display goes off. I assume this is some sort of time out. Is this a control board problem? I see many threads about control boards, but the problem usually seems to be that all options are not available, but I don't have that exact problem. I've replaced the door lock control assembly in the past, but I just want to make sure that whatever I replace is the correct fix before ordering parts. Thanks!!!!!!

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Old 04-20-2009, 03:04 AM
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A Model Number might help find info on this unit

Model Number Locator
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Old 04-20-2009, 06:34 AM
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Default model number

model number MDB9750AWS. Thanks!
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Old 04-20-2009, 07:11 AM
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Here are your parts
Replacement parts for MAYTAG MDB9750AWS | AppliancePartsPros.com

Here is a service manual and a couple tech sheets
http://www.servicematters.com/maytag...s/16022783.pdf
http://www.servicematters.com/maytag...s/16026391.pdf
http://www.servicematters.com/maytag...s/16023227.pdf

2H is probably a 2 hour delay setting.
Try to reset the unit. Since the door switch does not kill power to the board you have to either unplug the unit or trip the breaker for about half an hour.

If that does not work try different cycles and the diags to try and narrow it down.
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Old 04-20-2009, 07:51 AM
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Default fix options

the "2H" means a 2 hour cycle (normal wash), short wash is "82", etc. I did try unplugging the unit, but I only did for that few seconds...I will try unplugging and leave unplugged while I'm at work. Thanks for the clues... and the adventure begins!

Last edited by lhntx : 04-20-2009 at 10:19 AM.
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Old 04-20-2009, 06:10 PM
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Default still will not start

I left the unit unplugged all day. I still will not start. I removed the inner door and checked the connections on all of the electronics, and they all seem to be connected correctly. I followed the flow charts - but what is happening is not an option on any of the charts.
1. select desired cycle
2. close door
3. the correct time for that cycle is displayed
4. press start/cancel
5. unit fills with water
6. nothing else happens then the time display goes off after a few minutes
7. press the start/cancel again the unit drains
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Old 04-20-2009, 07:28 PM
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It does sound like the control board is shot.

The reason I say that is it is giving you a strange readout and from what I can find on the board is does not include any self diagnostics.

I would recheck the connection from the keypad to the control board.
Perhaps clean the connectors with either electronics contact cleaner or isopropyl alcohol and a tooth brush. Be sure to let the solvent evaporate before reconnecting.

In order to eliminate the keypad as a possible cause you will have to check it with a meter. The key outputs are shown in the tech sheets. You are not only looking to see that the keys close but also that they are normally open, especially the delay key.
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Old 04-20-2009, 09:09 PM
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Default keypad connections

When I checked all of the connections I did not see any indication that any of them had come loose. Checking them with a meter is above my limits of competence, unfortuneately. The display readings are actually normal. I guess that it's time to either get a new one or call a repair person. The unit was actually very expensive (over $800 originally), so a repair person is probably going to be the best option at this time. Thanks so much for your help.
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Old 04-21-2009, 03:46 AM
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Don't call them yet.

Looks like on this unit the fill level is controlled by the float switch.
On most units it is just a safety device.
Could be the unit looks at the float switch at the start of a cycle if it sees that the switch is closed it decides there is a problem and times out.

Check that the float is not stuck in the up position.
Check the switch with a meter to be sure it is closing/opening.

Also could be a problem with your fill valve.
The unit may allow a certain amount of time for the float switch to activate (the tub is full indication) if it does not see this it times out.

Check that the water valve coil has continuity.
Check that the valve is getting power at the start of a cycle.
If both the above are OK then odds are high that the filter screen on the input side of the valve is clogged up with crud. Remove the valve and clean the screen.
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Old 04-21-2009, 07:12 AM
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Default dw won't start

I won't be able to get to this until I get home this evening but some thoughts below on your suggestions...

Looks like on this unit the fill level is controlled by the float switch.
On most units it is just a safety device.
Could be the unit looks at the float switch at the start of a cycle if it sees that the switch is closed it decides there is a problem and times out.

Check that the float is not stuck in the up position. <what I think is the float does move up/down easily
Check the switch with a meter to be sure it is closing/opening. <I have no idea how to do this.

Also could be a problem with your fill valve.
The unit may allow a certain amount of time for the float switch to activate (the tub is full indication) if it does not see this it times out.

Check that the water valve coil has continuity. <
Check that the valve is getting power at the start of a cycle. <
If both the above are OK then odds are high that the filter screen on the input side of the valve is clogged up with crud. Remove the valve and clean the screen. <I believe that I will have to take the DW out of the cabinet to do this. It took me four hours to get it IN, so this might take a while (80 year old house and the flooring is uneven so the legs had to be adjust to accomidate as I slowly pushed it into place). This could be the cause since the water line on the street was replaced about 2 months ago and LOTS of crud came into the house lines aftwards. But there has been no indication of a problem with the unit filling up with water.

And the saga continues!..................
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