Artis Q ceiling, Model Number 10848281
If the coolant level in the cooling circuit drops below a certain level, this may result in a situation in which the X-ray tube is no longer sufficiently cooled and the system will display the message "TUBE HOT, have a break". Several minutes later the system will block X-ray to prevent further damage and display the message "NO XRAY: TUBE TOO HOT".
US Nationwide.
https://www.accessdata.fda.gov/scripts/ires/index.cfm?Product=Z-0975-2022