SOURCE: freezer freeze up
Your model TFX20JRBKWWW uses a defrost timer part number WR9X489 located behind the light shield in the fresh foods compartment. (top back area). Just in case you need to know, the defrost heater is a part number WR51X10101 located behind the back wall of the freezer.
SOURCE: Need to Replace Defrost Timer
check bottom back left should be a small hole with a small plastic place to turn with a srew driver some are insidethe fride on the left side arond where the lite is if you see a mall plate with a srew open it it should be there thanks from gilles
SOURCE: Freezer coils freezing, fridge warm
You might want to check and make sure the interior fan is working above the evaporator coils. If the fan isn't working the air won't circulate over the evaporator and it will frost over very quickly, and also cold air won't be pushed into the fridge side.
The fan might turn off when the door is open, hold the door switch shut while you check it.
SOURCE: maytag fridge defrost timer location
If this unit has the temp controls in the middle top of the fridge then it is in there.
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