Question about Maytag MDE9700AYM Electric Dryer

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No Heat / Low Voltage I bought the dryer 7-8 months ago. Dryer runs (everything) EXCEPT no heat. Have tried all cycles: nothing Opened the dryer up, am using the 'troubleshooting guide' from inside. Diagnostics show F31 (low voltage) Got out the multimeter... I have checked: Circuit box, wall outlet & power cord: all 120/240vac I have checked: relay connections on electronic control, Thermal Cutoff, High Limit Thermostat, and Heater Element: all have zero resistance What else could be wrong that I can check?

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  • Maytag Master
  • 19,396 Answers

Hi.

F31 means low voltage from main. Thermal Cutoff, High Limit and other internal parts cannot trigger the problem.

I think this dryer does not have a power board with relays either than control assembly.

The only internal parts that can cause the problem are control assembly and wiring to power cord.

Double check to ensure that the problem is not low voltage from line or power surge, then inspect wiring harness to power cord, and eventually replace the control assembly.

Since the problem is quite unusual, also call Maytag to check if they are aware of any related issue (F31 when line voltage is OK).

Here the parts and diagram.

Regards.

Ginko.

Posted on Jun 04, 2010

  • 7 more comments 
  • gstoner Jun 04, 2010

    Went through the 'saved diagnotic codes' all 4 saved codes are F 31

    Then performed the "Line Voltage Test" listed in the troubleshooting guide. Display momentarily blinked at 1 20, then straight to 2 45...and the drum started to spin. Drum continued to run and display stayed at 2 45 until power button pressed.

    "Double check to ensure that the problem is not low voltage from line or
    power surge, then inspect wiring harness to power cord, and eventually
    replace the control assembly."

    -done, nothing wrong that I can tell (visually or electrically) except for replace the control assembly.

    Would the F 31 code prevent the heater from working? I tried the normal power on cycle, drum spins, all indicators are good, no heat felt inside drum after 3 minutes.

    Could the heater coil itself have burned out or broken, leaving all of the sensors intact?


  • Ginko
    Ginko Jun 04, 2010

    Re:Would the F 31 code prevent the heater from working? I tried the normal
    power on cycle, drum spins, all indicators are good, no heat felt
    inside drum after 3 minutes.

    If F31 is displayed, yes. The timer board will stop. After resetting the code the machine will start and cycle until the F31 code is shown.
    If the F31 is shown at start, then there is either a voltage problem, or a faulty control.

    Could the heater coil itself have burned out or broken, leaving all of the sensors intact?

    The heater coil (the heating element in the electric dryer), can be easily tested by disconnecting terminals and ensuring that there is continuity (circuit not open). A blown element will leave circuit open.
    When element is blown the machine will still operate without producing heat.

    Can you please confirm that the model is
    Maytag MDE9700AYM, I will have a look at the service manual on this.

  • Ginko
    Ginko Jun 04, 2010

    Hi. On Maytag MDE9700 series electric dryer, wrong voltage should be error FE, there is no F31 listed.
    F31 is wrong voltage on several Whirlpool built dryers.
    Please check that we are talking about the same model.

    Thanks


  • gstoner Jun 04, 2010

    Troubleshooting guide is P.N. W10258376A, error code list on page 3, F 31 shown only in 'diagnostic mode'

    L2 shown in normal mode (turn dryer on for normal cycle, everything runs except heat, L2 flashes)

    Model: MEDE300VW1


  • Ginko
    Ginko Jun 04, 2010

    Thanks for the model number.

    Effectively F31 is a wrong voltage error. It can be caused by bad line voltage, ground problem, loose ground cable, and faulty control.

    Is it possible to connect the washer to a different main using an extension?

    PS:I will be out for about one hour.











  • gstoner Jun 04, 2010

    It is the same outlet that was used for the last 11+ years for the dryer. Present dryer has been running fine for 4-5 months before problem was discovered. [background history]

    Another main? only have one 240 in the house, other 240 is for water heater underneath with it's own box. or something different? main box only has one 240v breaker for dryer (stacked / one piece double 110)

    Since the dryer is 'seeing' 245 VAC, could the voltage be too high? and if so, what could cause it to jump up?


  • Ginko
    Ginko Jun 04, 2010

    The pint is that there are no much component between the main, power cord and the transformer on control board:



    The only think I can think of is jumping the door switch, even if I think that door switch causing this code is quite unusual. The problem is either AC power from line or the control board.



  • gstoner Jun 05, 2010

    Not sure what I did, but the Dryer now works. Tried everything you had mentioned, and figured that I would try to run it in normal mode. ran the dryer for 2 mintes, checked inside and it was warm. So far has dried 4 loads.

    *shrugs* I wish I knew what changed, so that I can make sure it doesn't happen again...

    Thanks for all your help :)


  • Ginko
    Ginko Jun 05, 2010

    Hi.

    If the fix happened randomly it is either a wiring problem, or the electronic control was jammed with some loaded capacitor helping the problem to persist after disconnecting.If problem is a jammed control, then the board components get definitively discharged by leaving power disconnected for a couple of hours. The electronic boards may also work erratically because of a "cold solder joint", that is a bad contact in the printed circuit board. This is also a problem that can start and stop by itself with vibration. Cold solder joints are tested reading Ohms in pcb circuit from contact to contact. A lose ground wire could have also caused the problem. If problem was wiring or cold solder joint , it may happen again.

    Regards.

    Ginko.


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