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There may be some buildup in the machine other than in the pot itself. To test this, try running the brew cycle with no beans. Taste the hot water. If it's acrid and bitter, your problem lies in buildup (such as the basket). Otherwise, if the hot water just tastes like hot water, then the temperature of the water has probably become too high (that will make coffee tastes more bitter). If this is the problem, there's probably no fix (just make sure you fill the reservoir with cold, not hot, water).
Believe it or not I had a customer once that left 6 pounds of butter on top of one of our brewers. They had it cleaned up on the outside so it took me a while to figure out what had happened but I could taste the rancid oils. We ran about 20 pots of just water through it... make sure you let it heat back up before each one. I think the only thing vinegar might help with would be lime/calcium build up so I wouldn't think it helps this particular situation. Good luck!
Try running a quarter-pot 50/50 solution of white vinegar and cold water through to clean out calcium deposits in the pump system. Use a clean filter to catch the pumped debris. When pumped through, let cool somewhat, and reuse the cold mixture again twice more. Pour out the vinegar solution and run several cold water loads through to wash out the taste. Hope this helps!
It sounds like the thermostat might be allowing the water to boil and cause the grounds to be scorched and making your coffee bitter. It also could be caused by the machine needing to be cleaned and delimed. I would recommend you do this first-and if you don't have the use and care manual, you may call Customer Service to have one sent out or access one at www.bunn.com @ home, then products.
You will need to pull you coffee maker out and take the top off and clean inside the water tank. Someone has put coffee from pot of old cold pot of coffee back threw. or something loke this. just clean inside and out. clean coffee maker and pots. hope this helps
Have a cup on old saw
The quality of the water is responsible for the flavor of the coffee. If you have had this coffee maker for a while it is probably coated with lime. Run a couple of cups of vinegar through it followed by a couple of pots of clear water. That will clean up your machine.
Once it is clean, try making a pot with bottled water, or water that you run through a water filtering pitcher. You will be amazed at the differenct.
you can always clean a coffeemaker with vinegar, but always pour in cold, so you can do it twice or more, but dont re-use the stuff you just used, wait till it's cold or just use some other.after use clean by let water through 2 or 3 times, (also only cold water)
After reviewing troubleshooting diagrams, I really couldn't find a solution to your problem.
The only thing I can suggest is to use 2 oz per pot of coffee grounds. Your 5 or 6 scoops assuming they are one ounce each is way more than enough.
Look under where your basket goes. Most bunn coffee maker has a flavor guard on the downspout. this down spout actually helps distributes the water over the whole basket of coffee grounds. Most of the time I see these missing, and when they are gone, they are gone.
Use less water for the amount of coffee you are using first. Sadly when there is not enough water, the coffee tastes bitter. Too much water tastes weak. Hot water extracts certain elements out of the beans even after grinding.
Always use a fresh paperfilter designed for your coffee maker.
If this pot is not work correctly still, I will suggest seeing your appliance repair technician.