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Rocky Mountain Vending

Machine Completely Dead — Full Diagnostic Flow

VendnetUSA VendnetUSA 4202139

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Machine Completely Dead — Full Diagnostic Flow

This flow guides systematic checks to determine if the power failure originates from the wall outlet, the machine's main power cord, or internal components like the main fuse or power supply.

High VoltageOperator8-12 min
Power8 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.

  • Burning smell detected at any point: stop
  • Main fuse blows repeatedly after replacement: stop
  • If you suspect an issue with the main fuse or the low-voltage power supply output, this requires the assistance of a qualified technician.
  • If you need to measure voltage at the controller board power input connector or trace the associated wiring, you must call a qualified technician.

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

    Using a known-good lamp or outlet tester, confirm the wall outlet the...

    operator-intermediatehigh

    Using a known-good lamp or outlet tester, confirm the wall outlet the machine is plugged into is providing power.

    Outlet Tester or Known-Good LampDigital MultimeterFlashlight or Work LightInsulated Gloves
    Stop conditions
    • If you suspect an issue with the main fuse or the low-voltage power supply output, this requires the assistance of a qualified technician.
    • If you need to measure voltage at the controller board power input connector or trace the associated wiring, you must call a qualified technician.

    Expected: Initial condition is documented before deeper diagnosis.

    Evidence to note: note

  2. 2

    With the machine unplugged, visually inspect the entire power cord fo...

    operator-intermediatehigh

    With the machine unplugged, visually inspect the entire power cord for cuts, burn marks, kinks, or damage.

    Outlet Tester or Known-Good LampDigital MultimeterFlashlight or Work LightInsulated Gloves
    Stop conditions
    • If you suspect an issue with the main fuse or the low-voltage power supply output, this requires the assistance of a qualified technician.
    • If you need to measure voltage at the controller board power input connector or trace the associated wiring, you must call a qualified technician.

    Expected: Initial condition is documented before deeper diagnosis.

    Evidence to note: note

  3. 3

    Using a known-good lamp or outlet tester, confirm the wall outlet the...

    operator-intermediatehigh

    Using a known-good lamp or outlet tester, confirm the wall outlet the machine is plugged into is providing power.

    Outlet Tester or Known-Good LampDigital MultimeterFlashlight or Work LightInsulated Gloves
    Stop conditions
    • If you suspect an issue with the main fuse or the low-voltage power supply output, this requires the assistance of a qualified technician.
    • If you need to measure voltage at the controller board power input connector or trace the associated wiring, you must call a qualified technician.

    Expected: Result is documented before continuing the route.

    Evidence to note: note

  4. 4

    With the machine unplugged, visually inspect the entire power cord fo...

    operator-intermediatehigh

    With the machine unplugged, visually inspect the entire power cord for cuts, burn marks, kinks, or damage.

    Outlet Tester or Known-Good LampDigital MultimeterFlashlight or Work LightInsulated Gloves
    Stop conditions
    • If you suspect an issue with the main fuse or the low-voltage power supply output, this requires the assistance of a qualified technician.
    • If you need to measure voltage at the controller board power input connector or trace the associated wiring, you must call a qualified technician.

    Expected: Result is documented before continuing the route.

    Evidence to note: note

  5. 5

    Locate the main fuse holder (typically near the power input area). Re...

    operator-intermediatehigh

    Locate the main fuse holder (typically near the power input area). Remove the fuse and check visually for a broken element or darkened glass.

    Outlet Tester or Known-Good LampDigital MultimeterFlashlight or Work LightInsulated Gloves
    Stop conditions
    • If you suspect an issue with the main fuse or the low-voltage power supply output, this requires the assistance of a qualified technician.
    • If you need to measure voltage at the controller board power input connector or trace the associated wiring, you must call a qualified technician.

    Expected: Result is documented before continuing the route.

    Evidence to note: note

  6. 6

    Carefully measure the low-voltage DC output at the power supply modul...

    operator-intermediatehigh

    Carefully measure the low-voltage DC output at the power supply module for a qualified technician.

    Outlet Tester or Known-Good LampDigital MultimeterFlashlight or Work LightInsulated Gloves
    Stop conditions
    • If you suspect an issue with the main fuse or the low-voltage power supply output, this requires the assistance of a qualified technician.
    • If you need to measure voltage at the controller board power input connector or trace the associated wiring, you must call a qualified technician.

    Expected: Result is documented before continuing the route.

    Evidence to note: note

  7. 7

    Carefully measure voltage at the controller board power input connect...

    operator-intermediatehigh

    Carefully measure voltage at the controller board power input connector for a qualified technician.

    Outlet Tester or Known-Good LampDigital MultimeterFlashlight or Work LightInsulated Gloves
    Stop conditions
    • If you suspect an issue with the main fuse or the low-voltage power supply output, this requires the assistance of a qualified technician.
    • If you need to measure voltage at the controller board power input connector or trace the associated wiring, you must call a qualified technician.

    Expected: Result is documented before continuing the route.

    Evidence to note: note

  8. 8

    Trace the harness from power supply to controller.

    operator-intermediatehigh

    Trace the harness from power supply to controller.

    Outlet Tester or Known-Good LampDigital MultimeterFlashlight or Work LightInsulated Gloves
    Stop conditions
    • If you suspect an issue with the main fuse or the low-voltage power supply output, this requires the assistance of a qualified technician.
    • If you need to measure voltage at the controller board power input connector or trace the associated wiring, you must call a qualified technician.

    Expected: Result is documented before continuing the route.

    Evidence to note: note

Tools for this route

Outlet Tester or Known-Good LampDigital MultimeterFlashlight or Work LightInsulated Gloves

Parts status

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

Candidate areas for part verification

Power componentsCooling componentsVend path componentsDelivery sensor componentsDisplay and keypad partsPayment components

Other Possible Issues

Switch routes if this symptom is not the closest match.

All issues
CoolingRefrigerated Section Not Cooling — Diagnostic FlowVend pathProduct Not Dispensing — Diagnostic FlowDelivery sensorDelivery sensor or bin problemDisplay / keypadDisplay, keypad, or selection problemPaymentsPayment or money acceptance problem