The basic error screens on a Redbox have different color backgrounds, indicating the problem at a basic level. Credits to @mordanthanus in the Discord for posting this info.
Black with white text – Kiosk is booting or updating. Black screens automatically clear themselves when completed, usually 5-15 minutes. Watchdog must be turned on for this screen to disappear. Watchdog can be turned on or off through the Redbox Desktop.
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Red with white text – Machine error alert. Generally requires human intervention but may fix itself during an overnight reboot.
Orange with white text – Kiosk is conducting a partial or full maintenance sync and will reboot to customer screen when complete.
Green with white text – The kiosk engine reports a database access error and places kiosk into maintenance mode. SOFTFILE0x errors.
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Red with white text – Machine error alert. Generally requires human intervention but may fix itself during an overnight reboot.
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Below are pictures of the error screens. Credits to @.jandajanda for these pics also posted in the Discord