Question about Bunn Dual TF DBC Coffee Maker

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I have a dual tf dbc that has a water dispensing problem. The left half of the machine correctly dispenses the proper amount of water per brew recipe. The right half of the machine consistently dispenses water at half the rate assigned in the recipe. I have checked the flow rate and adjusted it higher with no change in the amount of water dispensed. The machine has been in operation for only two months. Answers?

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Sounds like a solenoid blockage and or the spray head holes are blocked.

Posted on Jan 05, 2011

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Posted on Jan 02, 2017

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How many ounces or cups of ground coffee is standard for a Bunn dual dbc to make a 1/2 gallon of brewed coffee?


For a half gallon of brewed coffee you should start with a "volume" measure of 10 oz. The reason I recommend a volume measure is because the weight could be completely different using light roast or dark roast coffees. Brewing by volume you can have consistency throughout. The main object is to have the same surface area of grounds for your brewing. The 10 oz. volume should equal between 3.75 and 4.25 ounces by weight. Adjust by taste to your palette but don't sway too low in amount of grounds, otherwise you will stand to "over-extract" and your coffee will taste bitter and will have no body or mouth-feel.

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I have a Bunn Dual SH coffee brewer that does not dispense the same amount of coffee every time


The problem is either the liquid control board or there is something blocking the solenoid, or drawing water from the same line pressure. Also check the sprayhead for buildup.

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Hi,

The dispensers work by the siphon principle. You load the softener and at the proper time, the machine diverts water to the softener cup raising the level. In the softener cup, there is a tube loosely covered with a cap. When the level in the softener cup is raised high enough, a siphon effect is started and the softener is pulled from the cup into the washer. This will continue until the water quits flowing and air gets under tha cap, breaking the siphon. The amount of water remaining in the cup is dependent on the level of the cap, and the amount of residual water remaining in the dispenser fill tube once the siphon effect is broken. You can see this effect for yourself: take a measuring cup and slowly pour water into the softener cup, raising the level above the max line. When the level gets high enough, the contents of the cup will dispense. You can remove the cover cap that is a part of the dispenser and clean it; it will help. Removing the entire tray and cleaning all of the tubes and the cap assembly will also help. The only other thing that can be done is to change the dispensing supply valve, as it sounds like there may be some leak by after the fabric softener is dispensed. Having residual water isn't really hurting anything. It's only water, and the machine has dispensed the softener! Try the cleaning part first as this usually corrects the issue, and then the repair technician if it still bothers you. For as much as the extnded warranty costs, you should be completely satisfied with your machine.
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For the thermos you can use a small amount of purocaff and fill the thermos with hot water, let sit over night then rinse with cold water a few times to clean you can also use a soft brush to clean while the purocaff is in thermos. Clean around the showerhead with a clean towel, or you can use a filter with a little purocaff and brew into thermos and clean both in one shot.

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Hello. You will need to set the timer, this is done, if the settings are not locked out, using the brew button on the front, holding it until 3 clicks are heard, then just let it brew until you are satisfied with the level, and turn the brew off. This does take a little practice, and may need to be done repeatedly, and you should be prepared for overflowing, just in case :) Here is a link to your manual, please read the section that is for your unit, as it is for several.

http://www.bunnomatic.com/pdfs/commercial/manuals/29079.0000.pdf

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1 Answer

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IE is an inlet error indicating that the machine has not filled up to the correct water level within 10 minutes. Could be a bad inlet valve, low water pressure or a problem with the inlet hoses (do not use anti flood hoses with these machines, use only the included fill hoses).

It sounds like all of your problems lie with the water fill. If the dispenser compartments do not get water added to them then the soap, bleach, and/or softener will not dispense properly. Then it will still be present and may dispense on the next load instead.

It is also VERY important that you use an HE (high efficiency) detergent and the correct amount (2-3 tablespoons per load). Otherwise you could end up with oversudsing issues which can also keep the bleach from dispensing properly.

Also make sure to not use GEL bleach, GEL detergent or GEL softener as they are too heavy and will not dispense properly. If all of these recommendations do not help then there is a definite issue with the incoming water supply from the inlet valves (especially if the IE errors continue). In that case you will need a technician to check the inlet valves inside the machine.

Hope this helps, please rate my solution.

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