If this is a self defrosting freeze,then it is normal to periodically see an elevated reading during a defrost cycle. At 20 degrees, it was probably ready to complete its defrost cycle and come back on to return it to your cold setting.
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SOURCE: Frigidaire 25' chest freezer alarm goes off eventhough it is very cold
The temp sensor for the over temp alarm is probably maifunctioning if you are sure that the temp isnt rising
SOURCE: Kenmore Upright Freezer Model 253.9239780 Temp alarm, Temp rising slowly
you have a refrigeration issue partner let her go 16 yrs. is good service you can replace it for 3 to 5 hundred the repair will be that IF you can find someone with the r-12. don't go for a top it off and go deal the food you lose is to expensive for that to be economical.
SOURCE: Freezer will Not Go Below 8 degrees and Alarm keeps sounding
Our manual says it can take our freezer up to 48 hours to get back to the correct temperature. I found that to be the case when we loaded it fully for the first time.
SOURCE: Dead Upright Frigidaire Freezer
YOU MOST LIKELY HAVE A FREON LEAK AND RUNNING THE FREEZER WITHOUT FREON IN IT WILL KILL THE COMPRESSOR UNLESS YOU UNPLUG IT AND GET IT FIXED,THE COILS ON MOST FREEZERS ARE IN THE SIDE WALLS SO YOU DON'T HAVE TO CLEAN THEM LIKE ON YOUR FRIG.HOPE THIS HELPS-MIKE
SOURCE: Freezer Not Freezing Food
there is a circulation fan and also a vent. Either the fan is blowing, or there is a cloged vent.
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