The Hamilton ACW v4.23C is a programmable control board used in automated car wash and payment kiosk systems to manage motor drives, sensors, and user interface modules. Common failure points for this class of controllers include degraded power supply regulation (especially on the 12 V rail), burnt or tripped protection fuses, and firmware corruption that can lock the unit into a “boot loop” state; physical inspection often reveals burned capacitors or solder bridges on the board. First‑check diagnostics should begin with verifying the input voltage and ensuring the power supply output is within spec, then inspect all I/O connectors for loose contacts or corrosion, and finally review any error codes displayed on the kiosk’s status panel to pinpoint a specific fault.[oss-gpt-20b]