Reviewed by vending machine technicians · Last updated July 30, 2026
19 diagnostic codes · Glass-Front Vending Machine
Jam in Column — product stuck in delivery chute or column gate not resetting
Cooling Compressor failure — cabinet temperature above safe threshold for perishable products
Bill Validator communication error — acceptor not responding to VMC (Vending Machine Controller)
Coin Changer Low — coin payout tubes below minimum fill level; machine cannot make change
Door Open Too Long — the vending machine door has been open beyond the allowed time limit, triggerin…
Vend Motor Fault — a column vend motor failed to complete its dispense rotation, product may not hav…
Change Tube Jam — coin dispensing tube is blocked or jammed, preventing the machine from making corr…
Bill Validator Error — bill acceptor not recognizing currency or rejecting valid bills consistently
Temperature High — cabinet internal temperature has exceeded the safe threshold for perishable produ…
Compressor Fault — the refrigeration compressor has failed to start or has tripped its internal ther…
Coin Mechanism Error — coin acceptor not responding to VMC polling or dispensing incorrect change
Selection Sold Out — the product count for one or more selections has reached zero, or the sold-out …
Refrigeration Sensor Error — the cabinet temperature sensor (thermistor) is reporting an out-of-rang…
Power Supply Fault — the main control board is not receiving correct voltage from the power supply, …
Display Error — the front LED display or LCD user interface is not communicating with the main contr…
Payment System Error — cashless payment reader (credit/debit card or mobile payment) is not respondi…
Sold-Out Sensor Power Fault — the sold-out sensor circuit has lost power or has a short circuit, cau…
Motor Home Error — the vend motor for a column cannot find its home position after a delivery attemp…
Motor Stalled — the vend motor has stalled during a delivery cycle, typically caused by a jammed pro…
Vending DTC Hub — Independent vending machine diagnostic reference. Error code data compiled from manufacturer service manuals, field technician reports, and publicly available equipment documentation. Not affiliated with any vending machine manufacturer. All brand names are trademarks of their respective owners.