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The Thermal fuse of the defrost heater in my freezer is tripping.

My Blomberg freezer model FNT 1580i is giving an E4 error code due to the fact that the Thermal fuse of the defrost heater is tripping. This fuse has tripped twice in ten days. I need some answers to understand what might be tripping this fuse.

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  • Marco Vella Dec 05, 2012

    E4 means that there is something wrong with the defrost of the freezer, as in fact is because the defrost heater is not working due to the fact that the thermal fuse is breaking. What I need to know is what might be breaking the fuse since by just replacing it I'm not getting anywhere.

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  • 7 Answers

What is your controller? replace fuse if needed,review your control parameter and find the e4 means.

Posted on Dec 05, 2012

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Posted on Jan 02, 2017

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  • 42 Answers

SOURCE: Freezer won't defrost

savey73,
I think I know what is wrong. First the defrost thermostat you are talking about I believe is the round metal type with possibly a pink and an orange wire coming out of it. That is not the defrost thermostat as most people know it. That is a defrost overheat termination thermostat that opens only over 140 degrees F, that is why your old good one and your new good one show closed at room temp. If you read on the outside of the metal cover you will find it has a L140 indicating the limit of 140 deg.
Now to what should be causing your problem. You should find on the evaporator coil at the top left side of the evaporator coil a part that has 2 white wires going into what looks like about a 1" long X 1/4" round plastic thing. That little white plastic thing is a THERMISTOR. If it is bad your defrost will not work. Sounds like that is the only thing you have not replaced. There is no polarization of the wires That should FixYa
supertechks

Posted on Nov 24, 2007

SOURCE: lg multi air flow gr-349sqf

Could be a wire short,bad defrost heater, or comp. pulling too many amps which is between 2 and 6 or higher being bad. I would say the main problem is you purchased a LG fridge which is a poorly made fridge,sorry.

Posted on Apr 01, 2008

  • 110 Answers

SOURCE: LG Refrigerator Defrost Error ER DH

it the def t-stat, def. thermistor, or def. fuse whatever lg decides to call it this week that is causing your issue

Posted on Jun 13, 2008

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