This is a common question for the BTX-B.
It's a commercial brewer that needs to be pre-filled prior to turning on.. It also needs to be filled again with a full carafe for it to brew properly. I have a link below that will explain how to set up and use this brewer.
Aloha, ukeboy57
https://www.bing.com/videos/search?q=bunn+grx-b&&view=detail&mid=E6D1ADD550DA3DA5B120E6D1ADD550DA3DA5B120&&FORM=VDRVRV
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