Hi and welcome to FixYa, I am Kelly
Without your model number here is what most likely has happened:
The automatic defrosting system is not working due to a component failure.
The components of the automatic defrost system are:
1. Defrost control
2. Defrost heater
3. Defrost thermostat.
4. Wiring to inter-connect 1 - 3 above.
What your currently doing is a manual defrost cycle every 3 weeks because ice blocks the air-flow across the evaporator in the freezer compartment so everything starts warming up in the fresh food section first and finally the freezer as the ice block gets larger.
FYI you can unplug it... remove the contents from the freezer...use an external directed into the freezer compartment for just over 2 hours to do the same process your doing in 24 hours. Until the automatic defrost system is repaired you should do a manual defrost at least every 4 days.
Most units are on an automatic defrost cycle of 6 - 8 hours (usually) all the way up to 10.35 hours per cycle. Yours just is not working at all.
Thanks for choosing FixYa,
Kelly
Thanks for choosing FixYa,
Kelly
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