Question about Bunn CWTF 15-TS Coffee Maker

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BUNN CWTF-15 Not brewing full pot, only 1/2 pot..?

I have been in charge of a small coffee shop for 8months now, and this machine I have, has always been reliable...until about a month ago, when I moved the clean behind it....from that point on it only brews a half pot at a time, and the second time I brew I have to babysit it because the second brew (to Fill the pot completely) overbrews so I have to stand by with a cup to catch the overflow..which is horribly time consuming. The manual is vague on resolving this problem....please help.

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  • Pbradley2001 Apr 26, 2009

    My machine in the campground store has been working perfectly and all of a sudden now it keeps running water, actually enough for about 4 pots and there is no way to stop it :( Please someone help. Is there some way to re-program it?



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If this problem started after moving the machine, pull the machine out a little & look behind it for a kink in the tubing coming to the brewer. These brewers time the water coming through them, so if a kink is restricting the water flow, running the same amount of time equals much less coffee in the airpot.

Posted on Feb 12, 2009


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Hello. Bunn coffeemaker VPR Series. When water is poured in coffee starts to make. Carafe gets about 1/3 full and then just drips through filter for about 5 minutes. Never makes full pot.

VPS/VPR are pour over brewers. Like the 12 cup brewers you find at home, they need to be filled with 12 cups of water (a full pot), heated and then peculated over the coffee grounds and collected in a decanter.
BUT there is one main difference! The VPR and similar COMMERCIAL coffee machines are quick brewers. They usually have a pre-heated pot of water stored inside the machine.
* VPR's and similar machines REQUIRE a pre-fill and heating period prior to brewing. This means it's sitting on a level table and filled with water until water sprays from the brew head. At this point the unit is plugged in and the heater is turned on (there may be some water discharge from brew head as the water expands). Ready light will come on in about 15 mins.
* To Brew; Place coffee grounds in filter, place in funnel and brew head, clean empty decanter under funnel, slowly pour one full decanter of water (cold or hot) into brew tray. Do not overflow tray. Allow water level to sink before adding more water. Only fill with one pot as an equal amount will come out the brew head and funnel.
* Make sure the decanters are all the same size. do not mix a 12 cup pot with a 10 cup pot. One will over fill and the other will under fill. Make sure they match (in cup volume) FYI; Thermo Air pump pots are usually bigger than one pot. Typical filling only to 3/4th of the container. (I think most are in 2.5 to 3 liter sizes)
* If your not getting a full pot then the brewer was partially empty. The second brew (if done within the next hour) should come out full.
* If your still not getting a full pot then the water is leaking or is boiling off. Does it always steam from the top? Thermostat is shorted. Unplug the brewer and call vendor for service.
* Final; If your unplugging when not in use. Then follow the Pre-heat instructions mentioned above prior to plugging the brewer back in. If the tank has been emptied at night or dried up after an idle week. Then there is a chance you may over heat and blow the thermal fuse. Or at best have a half pot short brew as the water dried up.
* Note leaving the brewer plugged in without brewing daily is not a good idea. The water evaporates and eventually drys out the pot. Takes about 1-2 weeks but it does blow the fuse(s) and the unit will need service.
* Final; Follow the Bunn set up and care instructions (manuals from for down loading. *FREE*)
Aloha, ukeboy57

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