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Neptune gas dryer and sensor cycle

This is an MDG7500AWW with a sensor cycle tied to a "sensor" comprised of two parallel metal strips in the drying chamber. Clothes right out of the washer only dry for 4 minutes. I don't have a schematic but found a few online and noticed that two blue wires from the control go to each of the metal strips, which is how this was wired. The odd thing is that the other end of each metal strip wasn't connected to ground. I saw on various repair sites that Maytag has a ground wire assembly for the sensor. I wired up my own, tieing the ground to a nonpainted, enamled surface and nothing changed. Using a VOM, I could see some swing of the needle when pressing a wet papertowel across the metal bars but it was very low. The metal strips look pretty clean: no goo or rust. Any ideas on how to get this feature working again?

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  • charliew Oct 07, 2007

    hit accept instead of reply.

    To answer the Dr's questions, there were no diag/help codes listed in the system menu.

    I put a dry towel in just to get the dryer functioning. I setup a sensor dry cycle with damp dry and extra low heat. 34 minutes was the initial estimate. The tub started spining and a normal heat cycle was initiated. The time went to 33 minutes then to one and off.

    During this time, I measured between each tab on the sensor strip and ground, expecting to find 24v on one of them; neither tab showed any voltage. While the cycle continued, I went into diag mode: the output side showed that the motor and heat were on and that the sensor circuit was enabled. On the input side, it showed door was closed and the drum temp but no indication of what the sensor was detecting; that is, there wasn't even a line in the display that would have indicated that information (as opposed to having a line with a title and no value).

    I stopped the cycle and went into the system menu again. The input display showed "short circuit not sensed". I toggled the sensor via the left hand display but the right hand input display didn't change.

    This is beginning to sound like a controller issue that isn't putting out the 24v or is fouled up in some other way. Let me know if you have any other ideas or can suggest a new set of debugging steps.

  • charliew Oct 09, 2007

    I had to wet my fingers to get the short circuit test to work once I put the dryer in diag mode. I'm beginning to think that this has been working and the lack of the ground wires has thrown me off track.

    I'll check with my wife since I asked her to start using it with normal loads of wet clothing and will report back. I seem to remember that setting the dry level to normal left the clothes pretty wet but it could be that the bars have some goo on them. I'll wipe them with a paper towel and see if that improves the accuracy.

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Have a maytag gas dryer MDG5500AWQ bought new control board, can you tell me where the wires go to plug into the board ?

Posted on Apr 17, 2009

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The problem is most likely due to an airflow restriction somewhere. These usually occur in the vent duct that connects the back of the dryer to the outside of the house. These vents should be cleaned at least once every 2-4 years depending on what types of fabrics you usually dry, according to manufacturers. The best test for this is to pull the dryer out, disconnect the vent from the wall and start the dryer. Feel the amount of airflow coming out of the dryer, reconnect the vent and see how much air is coming out of the vent outside. It will be slightly less, but it should be close. If you cannot access the outside hood (on roof, etc.) you can also test this theory by disconnecting the vent from the dryer and try to dry a load in auto dry mode. If the load dries ok, then the problem is definitely in the vent. Any further questions are certainly welcome. Good luck.

Posted on Oct 14, 2007

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Well the metal bars dont work quite like you have tested above but i have to say you are on track here. It is correct that the 2 sensor wires are tird directly to the board so remove your gounding of the bars. The control has capacitiors that charge the bars with 24vdc and looks for the bars grounding to the wet clothes. The control board has the chassis ground tied into same connector as the sensor wire. so it doesnt need a ground tied to one of the bars like previous models. Enter service mode by pressing help and back keys for 3 secs Then see if there are any codes stored Then go to system check this is where you can test the sensor circuit you can even start a dry cycle with wet clothes enter service mode go to system check, and see if it says damp dry sensed, normal dry sensed, or short circuit sensed

Posted on Oct 07, 2007

  • joey  shearer
    joey shearer Oct 08, 2007

    The factory manual does not recommend checking for voltage at the sensor you wont get a good reading since the capacitor is charging and discharging the sensor bars.
    Go into diagnostic mode again
    and when you toggle the sensor circuit as you described you are supposed to put your fingers across the bars to short them out ! and then the reading should changed to short circuit sensed. Thats how you test it. Also try putting several at least 6 wet towels in and try a sensor dry cycle again and let me know if it just shuts down. It is normal to do end the cycle if you put one dry towel in. Its not sensing any shorts so it deleted the cycle.

  • joey  shearer
    joey shearer Oct 10, 2007

    Can you accept my diagnosis as solved yet???

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