Timing
The failure began on the first startup
That made the completed fan and defrost work more relevant than an unrelated new component failure.
Confirmed field case · Sub-Zero
The Timing Pointed Back to the Work Just Completed
The freezer had received a defrost assembly and cooling fan. On startup it sounded shorted, flashed its thermostat light and would not run the compressor or fan.
What changed immediately after the repair
- A defrost assembly and cooling fan had just been replaced.
- The new failure appeared on the first startup.
- The thermostat light flashed and a shorting sound was heard.
- The compressor and cooling fan did not start.
- No visibly melted wiring explained the symptom.
The same symptom can have a different cause. The immediate post-repair timing made the disturbed wiring especially important in this case.
Why the first inspection did not settle it
A missing burn mark did not clear the wiring that had just been disturbed.
Initial inspection
No visibly melted wire was found
The absence of visible damage did not prove that the connections were electrically correct.
Observed result
The thermostat light flashed and neither load started
The shorting sound, failed fan and failed compressor pointed back to the shared electrical path.
The confirmed installation error
The technician later reported that the cooling-fan wires had been interchanged during installation. The mistake applied line voltage to the fan housing.
No wire colors or terminal positions are reproduced here because the exact model and diagram were not preserved. Copying a different model's arrangement could recreate the fault.
The timing and the later physical finding support this diagnosis; they are not a wiring guide for another Sub-Zero model.
Correcting the connections resolved the complaint
The wiring was restored to the model-specific arrangement and the technician explicitly reported that the problem was resolved.
The transferable lesson is procedural: when a new electrical symptom starts immediately after service, recheck every disturbed connector and lead against the exact diagram before replacing another component.
Preserve the original routing
Photograph the original layout and label ambiguous connectors before disassembly.
Use the exact model diagram
Do not infer terminal positions from another model, a forum photo or wire color alone.
When a new electrical symptom begins immediately after service, compare every disturbed connector and lead against the exact wiring diagram before replacing another component. Photograph original routing and label ambiguous connectors during disassembly.
Cases closest to this diagnosis
Immediate shock hazard: line voltage on a motor housing can energize metal parts. Disconnect the appliance, do not touch or repeatedly restart it, and verify protective grounding and wiring with qualified service.