Couple of ideas.
Your weak coffee could be due to the machine not getting hot enough, which is usually caused by calcium scale buildup on the heating element (the "burner").
Try descaling with a citric-acid based cleaner, such as Dezcal or Durgol.
The second is the coffee your using is a weak blend. Try changing to a different coffee and see if the strength is better.
SOURCE: weak coffee
It sounds like you may have lost the sprayhead. It is under the brew basket (above the place where you put the basket with the filter and the coffee). Sometimes they get loose and you don't realize it and it can fall in the grounds and get tossed out after brewing.
SOURCE: Water supply for Bunn coffee maker
open the cover on the brewer- depending on your model, it could be the front or the back cover. look for a brew timer dial. turn this up slowly, running a brew each time to see if you now have a full pot
SOURCE: Bunn coffee maker leaks water
There are 3 seals in your unit that could cause your problem. there is a silicon seal right under the pour-in tray, and two on the top of the tank. one of those is for the thermostat, the other is for the sprayhead tube. any of these could leak, causing water to come out the bottom of the brewer. One other thing that can cause this is a scale buildup between the pour-in tray and the tank.
SOURCE: I have a bunn coffee maker the NHBX is the # it is
Please give Customer Service a call with the model and date code. If the machine is 3 years old or less, it will be replaced with a new machine. If it is older than 3 years, it can be exchanged for a reduced price.
SOURCE: Bunn Coffee Maker Leaks out the bottom
I have an older BUNN B10 pour-o-matic that I thought was leaking from the bottom. Upon close inspection, I found that it was leaking from the worn out washers located on the top of the tank, allowing water to run down the sides of the stainless steel tank. There's a great fix offered on Fixya.com that suggests going to a hardware store and buying a Gardner Bender GHG-1575 rubber grommet with a 3/4" hole and install it into the large hole in the basin. Then place a metal washer on top of the grommet and snug it up with the threaded fitting. Many folks say it's a great fix. I went a different route. I called BUNN customer service and spoke to a very nice woman who understood my needs and sent out a free repair kit that contained a new fitting, washer, and seal. I received it in a few days and it's working great. Beats going out and buying parts for a work around repair. BTW, the repair kit is called "Universal Retail Seal Replacement Kit #37091.0000"
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What does a spray head look like and how do I replace it
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