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Author Topic: Defrost cycle issue with my bottom mount freezer; warm fridge, freezer is fine!  (Read 891 times)

Offline ryanfordwells

  • VIP Member
  • Member Since: Aug 2016
  • Posts: 2

I am having a defrost cycle issue with my Kenmore bottom mount freezer (Model #: 596.69283011).

The freezer is working, but fridge gets warm. Even before this happens I can tell it is going to happen with extra frost on freezer items and really hard ice cream. Also I usually find some frost on the back vent in the top part of the fridge too.

The compressor seems to be running fine and the back fan near the compressor does as well. Removing the back panel in the drawer freezer reveals that the coils are completely iced up. Blower Fan from freezer into fridge is free of ice and is still working.

I have manually defrosted 6-8 times so far and fridge seems to work fine after (sometimes for as little as a 1 week, sometimes as much a month or so).

My amateur troubleshooting to date:
- Tested defrost heater: continuity test showed between 0-50 (something like 30 or 40). Shouldn't be the problem.
- Tested thermistor: continuity test, room temp test was 6.8k ohms and ice water test was around 28k ohms. Shouldn't be the problem.
- Tested defrost thermostat: continuity test in glass of ice water didn’t give a reading, replaced this part with brand new. After almost a month, same issue again. Warm fridge and coils blocked up with ice.

I keep reading about the timer and I do not know where that is located on my fridge model. I am assuming it is not a mechanical timer and would mean replacing a circuit board?

I am currently at a loss…any help REALLY appreciated. This manual defrosting is getting old.

Offline dab147315

  • Technician
  • Member Since: Oct 2010
  • Posts: 4228
  • Country: us
It is in the fresh food section like in this video. https://www.youtube.com/watch?v=aqptKoBxRyU

Offline dab147315

  • Technician
  • Member Since: Oct 2010
  • Posts: 4228
  • Country: us
They had many problems with them and you will have to program it when you get it. and this is the part number same as in the video.  WPW10503278

Offline ryanfordwells

  • VIP Member
  • Member Since: Aug 2016
  • Posts: 2
Thanks a bunch for the reply and especially the video link. I was hoping it wasn't the control board but it is seeming more likely the culprit. Do you know of any way to test if is the control board for sure? By process of elimination with the heater, thermistor, and defrost thermostat it seems that the control board is the only thing left to replace but I would like to be sure seeing that it is $200 CAD.

Offline baldwinappliance

  • Technician
  • Member Since: Feb 2014
  • Posts: 212
  • Country: us
put it into manual defrost and see if the heater comes on. better find a tech sheet as this is from memory...

open doors and hold down door switches. push fridge temp up three times and then release the door switches.
push fridge temp up again to confirm entry into diagnostics.
use freezer up arrow to select diagnostic test and fridge up arrow to turn the test on.
but i don't remember which test is for the defrost.

but...if all components check good then prob the board.