BUNN CWTF-15 Not brewing full pot, only 1/2 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 Bunn.com for down loading. *FREE*)
Aloha, ukeboy57

see deliming tip for bunn cwtf

see tip for callibrating a bunn cwtf

It is possible that the brew volume needs to be set, remove the front panel and you find the instructions to set the brew volume.

Check programming.This is very simple;turn switch on and hold brew switch until you here 3 clicks to start brew timer .When desired level is reached turn off on/off switch on front panel to set brew time.Check brew level now.

Could be something stuck in the brew valve or needs to be rebuilt.If not a possible bad brew timer.Rare that a brew switch is bad.

Hi. Let it run until the water tank is empty. Then just fill the pot to the amount of coffee you want to serve.and dump it in, now the maker can only make the coffee for the amount you put into it. Good luck. bobbyone

Which grommet, there are several on the bunn models, but the most commonly replaced one is the one for the P. stat. Remove the top panel there are 2 screws one in front and one in back, then lift the top 2 burners off machine that will give you access to the tank.

Adjust the thermostat, located behind the front panel, there will be a knob, turn all the way on then back about 1/4 turn.

Have you tried resetting the brew volume(make sure board is not set to lock).
The only other thing I can think of is replacing the timer board, because its not telling the solenoid to stop brewing.