Diagnose Evaporator Icing
USI USI 3155
Diagnose Evaporator Icing
Focused evaluation of evaporator ice accumulation, checking fan operation, door seal integrity, defrost capability, and sealed-system indicators.
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.
- Ice has encased wiring harnesses or connectors in the evaporator area: stop-and-escalate
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.
- 1
Inspect Door Gasket and Seal Integrity
operator-intermediatesafe-visualClose the door on a dollar bill or thin paper strip at several points around the perimeter. The paper should have light, even resistance when pulled. Look for visible gaps, cracks, hardening, or deformation in the gasket material. Check that the door closes fully and the latch engages.
Expected: Gasket grips paper evenly all around. No visible gaps, cracks, or light leaks.
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.
- Maintains canned-beverage compartment at target temperature through vapor-compression cycle.
- Compressor
- Condenser coil and fan
- Filter-drier
Do not open sealed-system or compressor areas unless a qualified refrigeration technician is handling the work.
cabinet glass front
spiral coil
refrigeration bay
compressorParts 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.