Service Issues
USI USI 3155
Choose the problem first, then open the focused route for tools, safety notes, locator help, parts status, and checklist steps.
Issue Finder
What Problem Are You Seeing?
Search symptoms, filter by system, then open the matching route.
Diagnose Continuous Refrigeration Run
Systematic evaluation of a refrigeration system that will not cycle off, covering airflow, door seal, temperature sensor, relay, and sealed-system possibilities in order of likelihood and safety.
Diagnose Compressor Not Running
Step-by-step evaluation when the compressor fails to start, covering power, relay, overload, and compressor conditions.
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.
Diagnose Evaporator Icing
Focused evaluation of evaporator ice accumulation, checking fan operation, door seal integrity, defrost capability, and sealed-system indicators.
Payment or money acceptance problem
Money, validator, coin, bill, or card-reader clues point to this route.
No power or dead display
Use this when the machine is dead, blank, unresponsive, or has power-input symptoms.
Product not dispensing
Use this when the product path, tray, spiral, vend motor, or delivery path is suspect.
Machine Context
Areas This Machine May Use
Use these areas as orientation only. Open a specific issue before following diagnostic steps.