Diagnose Multiple Auger Selection Failures
USI USI 3155
Diagnose Multiple Auger Selection Failures
When multiple auger selections fail simultaneously, the issue is likely common to the auger power bus, motor driver circuits, harness, or controller rather than individual motors.
Qualified technician handoff: stop before live electrical testing, sealed-system refrigeration work, compressor service, or protected-compartment access unless a qualified technician is handling the work.
Checklist
Guided Diagnostic Steps
Work from low-risk checks toward technician-level inspection only when evidence supports it.
You can read or print the route now. The first checkbox click opens the service contact gate.
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Branch: Determine Evaporator Issue Type
operator-intermediatesafe-visualBased on findings from the previous step, categorize the evaporator-side issue: Is the fan not running at all? Is ice blocking the coil? Is the fan running but airflow is blocked by product?
Expected: Issue categorized as: fan-failure, ice-blockage, or product-blockage.
Evidence to note: photo
Tools for this route
Location Help
Where to find this
Use this as orientation before touching the machine. It is location help, not a repair instruction.
Start at the affected product shelf or selection row; compare the tray, coil, and product path with a nearby working selection.
- Carries power and signal between controller, motors, sensors, and refrigeration components.
- Main wire harness
- Motor harness runs
- Refrigeration harness
Do not open sealed-system or compressor areas unless a qualified refrigeration technician is handling the work.
cabinet glass front
control board generic
wiring harness
display keypadParts status
Exact public parts list not verified yet. Use this route to identify the system before ordering.
Candidate areas for part verification
Other Possible Issues
Switch routes if this symptom is not the closest match.