Need Appliance Repair Help? Ask a Technician for Answers ASAP
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If the compressor and condenser fan are running and the evaporator coil is not frosty then the unit is low or out of freon. These often developed leaks or sealed system issues causing that problem. This is a major repair though and is not a DIY project at all. You may want to call a tech out to confirm and decide whether you wan to put the money into a fix or get a new unit.
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The tape is always melted on those units, are you talking about the tape on the evaporator?
ALso they are known for fast leaks and I have seen a lot fail in less than 24 hours for a leak or internal capillary tube or filter drier blockages
No that is not normal the heater got stuck on for a long time..this could have caused a blow out. Is the compressor running?
Check and see if the compressor is running, yes the defrost thermistor likely failed or the heater relay on the board stuck closed like some of them do.