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Rocky Mountain Vending

Single Column Vend Failure

AMS Sensit II Glass Front Vendor

SnackMedium confidenceExact parts not verified
Back to all issues

Single Column Vend Failure

Diagnose why one specific column fails to dispense while other columns work normally

High VoltageOperator5-10 min
Vend path3 stepsoperator-intermediate

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.

  • Motor hums but does not rotate: Stalled motor — check for mechanical bind first, then condemn motor if helix is free.
  • No command voltage at harness with other columns working: Controller output for that column may be failed — verify with harness swap test if possible.

Checklist

Guided Diagnostic Steps

Work from low-risk checks toward technician-level inspection only when evidence supports it.

Printable checklist

You can read or print the route now. The first checkbox click opens the service contact gate.

lead gated
  1. 1

    Clear product and test for mechanical jam

    operator-intermediatelow

    Remove all product from the affected column. Manually rotate the helix by hand with the power off to feel for binding or obstruction.

    Stop conditions
    • tray-bent-or-broken

    Expected: Helix rotates smoothly by hand without catching

    Evidence to note: note

  2. 2

    Test vend from service mode for that column

    operator-intermediatehigh

    Enter service mode and initiate a test vend for the affected column. Observe whether the motor attempts to turn.

    Expected: Motor rotates helix through a complete cycle

    Evidence to note: photo

  3. 3

    Check motor harness and command signal

    operator-intermediatehigh

    Power off. Disconnect the motor harness for the affected column. Inspect pins. If qualified, reconnect and test vend while checking for voltage at the motor connector.

    Stop conditions
    • harness-wiring-damaged-or-burned

    Expected: Motor connector receives drive voltage during vend command

    Evidence to note: meter-reading

Tools for this route

No special tools listed

Location Help

Where to find this

Use this as orientation before touching the machine. It is location help, not a repair instruction.

Vend Motors

Start at the affected product shelf or selection row; compare the tray, coil, and product path with a nearby working selection.

  • Drive individual helix coils to dispense selected products
  • vend-motors-per-column
  • motor-harnesses
  • motor-mounting-brackets

Do not open protected compartments unless a qualified technician is handling the work.

cabinet glass frontvend motor

Parts status

Exact public parts list not verified yet. Use this route to identify the system before ordering.

Candidate areas for part verification

Vend path componentsControl Boards and Program ChipsVend MotorsTemperature and Product SensorsInterior Lighting ComponentsHelix Coils and Tray Assemblies

Other Possible Issues

Switch routes if this symptom is not the closest match.

All issues
CoolingCompressor Will Not Run — Refrigeration FaultDelivery sensorDelivery Sensor Diagnosis — Remove Product StuckPowerNo Power to Machine — Internal DiagnosisControllerController or electronics problemDoor / lockDoor, latch, or lock problem