Defrost drain pan overflowing

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Brand:Theermador
**Model Number:**KBUDT4260A
Main Symptom:Drain pan overflowing
What happens & when:

Freezer and refridgerator are working in the side by side. The defrost drain is not clogged. There is no buildup of ice, but the unit is dripping water into the drain pan and not EVAPORATING, thus overflowing onto floor. It is not leaking from within the unit. Would replacing the compressor fan fix the issue? The only thing the refridgerator technician replaced 6 months ago was the relay start switch. The unit does makes little noise and does any unusual motor sound. Please advise.

Error Code (if any): none
Parts or tests already tried: relay
Photos / video link:

Because of how this model is designed, the condenser fan isn’t a factor here. Instead, it uses a heater loop in the drain pan to help cool the refrigerant while slowly evaporating the drain water. Is the compressor running often or staying on for long stretches?

IMO, I think it runs more often than longer. I do notice the heater loop is never warm lately even when the compressor is running. Is the heater loop easy to replace and findable?

Is the heater loop connected to the compressor?

The heater loop is a part of the sealed system. If the system is running more frequently, this can cause it to go into a defrost mode more often, resulting in the drain pan over filling. Are there any air gaps in between the door gaskets and the liner that might be allowing warm air into the appliance?

There are no gaps from what I can tell, but the overflowing happens every 3 weeks. Would that be an indication of a gap? The latest overflow was due to refrigerator door was found open.

if it is part of the sealed system, then repair would be out of question and would need a replacement. Correct?

If the heater loop had a pin hole, a full sealed system replacement would be necessary. However, it does not sound like this would be the case. If it is reaching proper temperature, an air gap or a door being left open would cause the unit to go into defrost more frequently, thereby causing this overflow.