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.