Question about Maytag M7DH45B2A Dehumidifier

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Location of Maytag M7DH45B2A motor fuse

My Maytag model M7DH45B2A dehumidifier shattered the squirrel cage fan, stopping the motor. The motor turns freely by hand, but does not spin when the dehumidifier is turned on. The compressor does kick on. I have noted other users on FixYa have had the same problems, and some have apparently checked the fuse. However, no one has specifically said where the fuse is located. I have the back off of the unit, and noted that the motor has a sticker with a wiring diagram showing a fuse. I also went as far as taking the fan housing loose, but was not sure which screws to remove to go further, like to get to the pcb. Hopefully all I need is the $20 fan cage and a fuse, and not an additional $50 motor. Thanks in advance for your help.

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  • Rather Not
    Rather Not Aug 29, 2008

    I disassembled the unit further and found that fuse, in the corner of one of the circuit boards, covered by a blue semi-transparent boot. I pulled the fuse, and a continuity check showed it is OK. While powered on, there is also 120v coming from each of the 4 wires (red/yellow/blue/white) going to the motor. I took the motor apart, and there is no apparent fuse in the wiring or in the motor. I assume the fuse that is shown in black wire (neutral) in the diagram on the sticker on the motor may be within the part of the wiring that has string binding it to the motor's windings. Please see pictures.

  • Rather Not
    Rather Not Aug 29, 2008

    FixYa's system seems to have cropped the wiring diagram shown on the label.



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I'm fixing one of these too. Take the top off (follow the AC cord) and the fuse is on the PCB.

I am also looking for a better wiring diagram - the control panel on mine does not light up.

Posted on Aug 22, 2008

  • 2 more comments 
  • DMaurer678 Nov 04, 2010

    The fuse on the circuit board is NOT the fuse shown in the above diagram. The fuse in the diagram is a thermal fuse located inside the motor housing. You'll need to cut away the wrapping around the black wire to find it. A replacement (128C) can be purchased at Radio Shack. You can confirm that this is the problem by using a small jumper wire to jump the black wire to the blue wire coming from the motor while the unit is running.

  • Rather Not
    Rather Not Jan 27, 2013

    While I was looking for information about the Twilight

  • Rather Not
    Rather Not Jan 27, 2013

    Thank you for the response about the dehumidifier, DMaurer678! While I was looking for information about the Twilight Sentinel module in my 2005 Buick Park Avenue, I came across the posting I made a few years ago responding to another person's issue about their 1992 Buick Roadmaster Twilight Sentinel. Man, FixYa is an awesome source of information!! Anyhow, I looked for other topics that I had posted in, and found this one about the dehumidifier again. I was excited to see a response to this, as my dehumidifier has been out of commission for a really long time. Anyhow, I got the motor out and cut into the wiring jacket containing the black (and also blue) wire. I found the thermal cutoff (aka thermal fuse). I finally figured out that 128C isn't a part number, but rather stands for 128 degrees Celcius (essentially the same as 130 deg C). Per their website, Radio Shack doesn't seem to sell the NTE fuse in the 128 C (Functioning Temperature) variety. However, the part is NTE 8125. I'll still ask if RS can get the thermal fuse, but now at least I know how to fix the dehumidifier. I did test, and there isn't any continuity through the fuse. There is continuity after the fuse (at the end of the black wire), to the blue wire. So, I know that replacing the fuse will fix this issue!

  • Rather Not
    Rather Not Jan 27, 2013

    The picture is a little fuzzy, but you can see the thermal fuse here, circled in orange. I also noted that one end of the fuse is soldered to the blue wire (circled in green).



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If these suggestions do help you solve the problem, please give my reply a rating to help others judge my knowledge / guessing skills.
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