Question about Maytag Neptune MAH7500WH Front Load Washer

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Maytag Neptune MAH7500AWW Speed Indication Error - Won't spin up...

I have a MAH7500AWW Maytag front load washer. Anytime the machine goes to spin or tumble I get a Speed Indication error.

Wife has said that the machine hasn't been spinning clothes as dry as it normally does. I conducted the Motor & Motor Control test by pulling the JP4 connector from the motor control board, performing a system check, toggle motor control on and let it spin at 50 RPM. All seems to work well. A quick switch back to the system check shows the torque value going back to zero as it spins down but no RPM value. I suspect that is because the JP4 connector is removed.

Since the problem appears to be related to the inability of the machine to spin up to speed, I setup a custom spin cycle and entered Service Mode to watch the values. It goes correctly through the drain cycle and then starts to spin slowly at first. RPM and torque appear to rise correctly then when the rpm steps up quickly from about 85 rpm to roughly 150, all of a sudden the RPM goes to 0 and you see the torque value slowly return to zero as the spinning stops. Seems to me like it loses the tach signal as soon as it tries to ramp up to any speed high enough to spin dry.

As best I can tell the tach sensor must be built into the motor. I'm suspecting a faulty motor but would like another opinion. Would also appreciate suggestions of other tests I could try to confirm a faulty motor.

Also get a help code 41 - Failed to verify tach
Schematic diagram in washer says 41: Loss of Tach Signal during door unlock sequence. I think this is just generated as a result of losing the tach signal during the cycle and when I exit the cycle (when the door unlock command is given) 41 is generated because the tach signal is still missing. In other words, I think the loss of tach during the cycle (as indicated on the touch screen diagnostics) is the cause of the spin shutdown and is the real problem.

Any help would be greatly appreciated.

Model: MAH7500AWW
SN: 10813283ZB

Thanks,
Dwight

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Sorry, I cannot solve this. I just wanted to post a couple of useful tips for anyone else out there who happens to be diagnosing their MAH7500AWW.

1. You can put the washing machine into service mode by pressing the <back> and <help> buttons for 5 seconds and then releasing.
2. There is a large folded troubleshooting schematic located under the top console. You have to remove a few screws and lift it up to pull it out.

Posted on Sep 17, 2009

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My washer just gave me the same error.. a Motor Speed error. I called Maytag and they told me it sounded like the motor was bad and the replacement motor is about $200 + the service call on top of that! Yikes!! I really wanted a better solution, as I can't afford that type of repair (nor would I spend that much on a repair to a 9yr old machine). I found a posting which has the tech manuals and I have copied and placed on this site. Hope it helps!!

http://www.servicematters.com/maytag_library/docs/16010061.pdf

http://www.servicematters.com/maytag_library/docs/16025823.pdf

http://www.searspartsdirect.com/partsdirect/getModel!retrieve.pd?modelNumber=MAH7500AWW

Posted on Jun 17, 2010

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I am having the same problem, I checked the tach signal on jp2, seemed to be fine. i was getting a signal from the tach when it tries to spin up, then the lcd gets up to about 130RPM, then shows zero rpm (when the tach is above 250Hz) the tach signal gets up to about 500Hz and the motor spins down...
when the tach gets back down below 250Hz, the lcd reports an rpm again (about 130RPM) which slows down to zero as the motor stops

I might contact maytag again. We called them when the problem first appeared, they told us to contact this refrigeration company to get it repaired, the guy came over, said it was the lock mechanism, came back, replaced it and found it wasn't the lock mechanism. a day later he called and said it was probably the main board! clueless...
I think it might be a software issue, which replacing the main board will probably fix, $300 plus installation is pretty pricey for a software update.. unfortunately I don't think it will be very easy to get the latest update myself.

Posted on Mar 18, 2010

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