Don't replace it yet; learn how to diagnose and fix internal heating failures.
The controller cuts power if it detects heating element resistance faults or erratic sensor signals.
Cold air blowing often means a tripped thermal fuse hidden deep within the unit's wiring.
Check for continuity; an 'OL' reading indicates the heating element or internal fuse has failed.
Fine oil vapor coats the NTC sensor, causing artificial throttling and critical system temperature errors.
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