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I have a BUNN MCU Single Cup Coffee maker and the ground coffee drawer literally explodes off the machine. I've maintained the machine according to Bunn's guidelines. Any suggestions?

I called Bunn and they sent me a replacement screen for the bottom of the drawer, yet this hasn't solved the problem. It's a dangerous situation as the coffee and grounds coming out of the drawer are hot and has burned my hand. Any suggestions?

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

Hi there,
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Posted on Jan 02, 2017

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  • 131 Answers

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.

Posted on Feb 13, 2009

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  • 1 Answer

SOURCE: MY BUNN COFFEE MAKER LEAKES WATER

Yes Bunn will send you a repair kit free of charge. Just apply a bead of silicon below the rubber gasket before you tighten it down and it will solve the problem.

Posted on Mar 16, 2009

  • 244 Answers

SOURCE: Bunn coffee maker leaks all over the counter. What

there's probably a 'silicon rubber' hose that feeds hot water to the 'grounds basket'- it may be loose, or damaged. is it leaking water, or coffee?? we have a bunn 8-cup, which has a pre-heated water tank that brews a pot in about 3 min. energy waster, but when you need coffee, you need coffee!!! is your filter holder properly centered? is the carafe lid hole clean and un-obstructed?
if it's leaking water, and not too costly to replace- you may consider replacing it with a new one!
good luck!

Posted on Oct 09, 2009

NewsView
  • 40 Answers

SOURCE: Coffee grounds overflow out of basket into top of coffee pot.

Coffee overflowing onto the counter is a common complaint found in response to many automatic drip coffee makers. The following are potential solutions that can be used to rule out "operator error" vs. a defect or malfunction:

1. Do not "pack" or otherwise overfill the cone/basket with grinds.
2. Ensure you are using the correct grind for an automatic drip coffee maker, neither too fine nor too course. (See instruction manual.)
3. Do not overfill with water. Use the carafe to pour water into the reservoir. This is because a "cup" in coffee terms is defined as 6 oz, not 8 oz. Note: Some coffee makers define as little as 5 oz as a cup.
4. Make sure the filter cone/basket clicks into place and that the carafe is centered and pushed all the way in.
5. Try a permanent filter rather than a paper filter or vice versa.
6. Only use the correct permanent or paper filter (see manual).
7. Verify that the Pause 'n Serve button isn't sticking. If it is activated too long the brew will escape over the top of the cone/basket. This may be more apt to happen if the alignment of the carafe and the basket is incorrect.
8. Clean your machine with vinegar or as instructed by your user manual at least three times per year, more if your water supply is hard. A properly cleaned machine is less likely to suffer a burned out heating element, to take too long to brew, to produce "off" tasting coffee, or to clog and overrun the filter basket as the water runs through the grinds.
9. Ensure that the coffee machine is sitting level on the counter.

Posted on Jan 04, 2010

Jafu
  • 9 Answers

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"

Posted on Jun 25, 2012

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Bun coffee maker model MCU has stopped emptying water completely from the coffee grounds drawer. How can I fix this? We have cleaned filter already. Thank you!


Check out the following link that shows how this MCU brewer works. Please note position 8:04 on the time line of the video. Note the loud 'flushing' or air blast sound that is at the end of the brew cycle. If your brewer does not perform this air blast (it forces all the water out of the brew chamber or cup.) then the air pump is bad and needs to be replaced.
* check your warranty and have Bunn service this machine.
* There are no customer service parts inside this brewer.
Aloha, ukeboy57

May 24, 2018 | Coffee Makers & Espresso Machines

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After brewing with a Bunn MCU, it does not fully use all of the water; some remains in the coffee pod. It does this with all textures of coffee grounds. It makes cleanup a mess. Any ideas? Thanks!


First, Though I have worked on many Bunn commercial systems. I'm not quite familiar with the newer MCU though I've worked on similar single cup home systems.
* Most single up systems like the Cup/Pod/Capsule usually have a air flusher that pushes all the water out of the brewer to extract all the flavor and prevent old liquids left in unit.
* If your still dripping, have wet pods/capsules/cups, then it sounds like the air pump is not turning on or not working properly. Bad pump could be a cracked or loose hose as the pumps don't really wear out as it's only air (hopefully clean air, no dust). Call for service.
* The brew cycle might not be completing thus not continuing on to the next step which is to pump air in. Brew sensor or timer out. call for service
* Computer is out or fried (especially after an electrical storm). Call for service.
* Finally, most of these home units do not have serviceable parts. Most take at least an hour to service. So if your not in the warranty period it may not be worth fixing. But be sure to call your service provider or MFR for advice.
Aloha! ukeboy57

Mar 23, 2017 | Bunn Coffee Makers & Espresso Machines

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    1 Answer

    WHY HAS MY CAFE STOPPED WORKING? IT DOESNT DRIP COFFEE INTO CUP.


    Sounds like your machine is congested. Consider cleaning out the nozzle or the filter.

    Sep 22, 2014 | Bunn Commercial Bunn My Cafe Pourover...

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    Coffee maker is making very mild coffee. Looks more like tea. ANything that can be done?


    You may need to add more grounds. We use 1/2 cup coffee grounds for our 10-cup machine, and it comes out perfect every time. If you prefer to grind your own beans, use 1/2 cup of beans, then grind.

    Nov 29, 2010 | Bunn 10 Cup Home Coffee Brewer

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    When I put in, 6 cups of water, if the 10 cup Bunn coffee maker after it has sat overnight, it only expels about 4 - 4.5 cups. I don't think it can all be evaporating or being absorbed in the grounds can...


    look for water leaks around pot. Otherwise do a daytime brew to compare your difference between the amount poured in and what comes out. Please note that less water should mean using less ground coffee. Suggest 1 heaping table spoon per brewed cup.

    Feb 10, 2010 | Bunn 10 Cup Home Coffee Brewer

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    Grounds in coffee. am using bunn coffee filters and still have a mess in my cup and in filter


    Are you using a finer ground coffee? Or do you have a water softener, use filtered water or bottled water? If so, please call customer service to get a flow restrictor sprayhead which will eliminate this issue.

    Dec 07, 2009 | Bunn NHB Coffee Maker

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    Bunn coffee maker leaks all over the counter. What


    there's probably a 'silicon rubber' hose that feeds hot water to the 'grounds basket'- it may be loose, or damaged. is it leaking water, or coffee?? we have a bunn 8-cup, which has a pre-heated water tank that brews a pot in about 3 min. energy waster, but when you need coffee, you need coffee!!! is your filter holder properly centered? is the carafe lid hole clean and un-obstructed?
    if it's leaking water, and not too costly to replace- you may consider replacing it with a new one!
    good luck!

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    Bunn Coffee maker leaking out of the bottom of the coffee maker when the coffee maker is not making coffee.


    that needs to go back to bunn for a replacement tank, they will likely only charge you for return shipping

    Dec 10, 2008 | Bunn NHB Coffee Maker

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