Reviewed by vending machine technicians · Last updated July 30, 2026
6 diagnostic codes · Merlin IV Glass-Front Vendor, Royal Vision Glass-Front Vending Machine, Royal Vision/Royal Merchandiser Glass-Front Vending Machine
Selection switch stuck — a product selection button is being held down or has shorted closed
Refrigeration compressor not running — control board calling for cooling but compressor contactor no…
DEX/UCS data communication error — telemetry module cannot upload sales data to the route management…
Refrigeration High Temperature — cabinet temperature has exceeded the programmed threshold (typicall…
Refrigeration System Error — the compressor circuit has failed or the cabinet temperature sensor is …
Compressor Overload — the compressor overload protector has tripped due to excessive current draw or…
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.