Premium Preserva® models feature separate evaporators for the freezer and fresh food compartments, governed by an electronic 3-way stepper refrigerant diverter valve. When the stepper valve sticks in the freezer circuit or the fresh food evaporator fan motor stalls, the refrigerator warms to 50°F while the freezer remains sub-zero. We test stepper pulse signals and replace defective valves and fan motors.
- Service Test 24 diagnostic pulsing of the electronic 3-way refrigerant stepper valve
- Live DC voltage and tachometer feedback testing on fresh food brushless fan motors
- Precision sealed system recovery, evacuation, and valve replacement by EPA-certified techs