Display, keypad, or selection problem
USI 3120 GF12 II Glass Front
SnackMedium confidenceExact parts not verified
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Display, keypad, or selection problem
Use this when the display, keypad, selections, or user controls are the main clue.
Low RiskOperatorNeeds review
Display / keypadSupport guidedsupport-guided
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.
No public diagnostic checklist steps are approved for this page yet.
Tools for this route
No special tools listed
Parts status
Exact public parts list not verified yet. Use this route to identify the system before ordering.
Candidate areas for part verification
Display and keypad partsControllers and PC BoardsVend MotorsPower componentsVend path componentsCooling components
Other Possible Issues
Switch routes if this symptom is not the closest match.