Ok, I too ran into issues sourcing the correct Timer for my Maytag MDE8400AYQ Dryer (electric) Serial 24978957GJ.
To cut to the chase - Maytag will swear up and down that the correct timer is #33002855 but as noted in this thread THEY ARE WRONG. The correct timer is #33002808. I should have listened to the advice here, it would have saved me the cost of a timer and burned out board. (The 2855 timer blew out the 2905 board when used in Timed mode)
I strongly recommend replacing the dryer sensor/chime unit at the same time. Part #33002905. My experience has been that timer failures (or incorrect timers) can damage this board. Also, I noticed that the 2905 unit has several sets of components which can easily bend and contact each other. I added some small bits of heat shrink tubing (just slipped on, not shrunk) to insulate them from each other. If this is not done, it is easy to bend and short these during installation or from contact with the wiring harness.
I contacted several part suppliers and was given 3 different part numbers. In one case, I was told to replace the wiring harness along with the timer. The recommended harness was for the Series 16 dryer, but this harness will not work with the 2905 board.
My dryer was manufactured in May 2005 and had a serial number that began with 24. It had the single board IntelliDry Dryness / Chime unit - matching Whirlpool part 33002905 which is listed as being introduced with Series 23.
You can find a parts list for this dryer here:
https://www.maytag.com/digitalas...ist%20-%20MDE8400AYQ.pdfThe original timer was marked:
5109A Maytag 63720670 M295
Kingston 71020-A00802
The wiring harness tag was marked:
May-05-05 PT# 63406950_REV_B
The printed wiring diagram taped inside the control panel was marked with a part number: 63406750 - which describes the harness part number 63406950.
Here are my conclusions regarding these Whirlpool part numbers:
Timers:
33002854 Series 10
33002808 Series 16 - and series 24
33002855 Series 19
Wiring harnesses (electric)
33002756 Series 10 (dual board IntelliDry) printed version with Dryer is ????, parts list id is ????
33002810 Series 16 (dual board IntelliDry) printed version with Dryer is ????, parts list id is 15003030
33002908 Series 23 (single board IntelliDry) printed version with Dryer is ????, parts list id is 15003369
33002957 Series 24 (single board IntelliDry) printed version with Dryer is 63406750, parts list id is 15003539
Wiring diagrams:
Maytag # Whirlpool #
15003030 Series 16
15003369 Series 23
63406750 15003539 Series 24
Keywords:
Maytag MDE8400 MDE8400AYW MDE8400AYQ 63720670 Kingston 71020 63406750 63406950_REV_B 63406950 Whirlpool 33002808 33002810 33002855 33002748 33002905 63406750 15003539