Question about Bunn NHB Coffee Maker

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How to fix a leak on a bunn NHBX coffee maker

Leaks cold water from the the upper resevoir

Posted by Anonymous on

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The leak is most likely between the water reservoir and the tank. Bunn uses a soft silicone seal for that connection that gets compressed over time and starts to leak water whenever you make a pot of coffee.

It's planned obsolescence. Bunn won't sell you a new seal. So you have to improvise. But it's simple enough to do.

Remove the top cover and the plastic water reservoir right below it. Don't tamper with the little valve that opens when you close the lid.

Look for the seal. It could be stuck to the bottom of the reservoir, or sitting loosely on top of the metal tank. Make sure to preserve its top-to-bottom orientation (don't put it back in upside down).

Apply a narrow bead of clear silicone into the grooved side of the seal. Press the seal gently onto the reservoir, then apply a thin layer to the smooth side.

Re-install the reservoir and reassemble the unit.

Posted on Nov 23, 2014

  • Mary Mar 19, 2015

    how do you remove the reservoir cover?

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Posted on Jan 02, 2017

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  • 189 Answers

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.

Posted on May 19, 2010

  • 189 Answers

SOURCE: I have a bunn coffee maker the NHBX is the # it is

If you will locate the date code on the bottom of the unit and then call Customer Service, the machine will be replaced at no cost or if over 3 years old, at a reduced price.

Posted on May 19, 2010

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My 10 cup Bunn coffee maker leaks from the top of the water resevoir, from the right top side and from the back top. It looses aprox. 2 cups of water onto my counter while brewing. What has happened to...


I have the same problem and I took the coffee maker apart to find out why. It has to do with a leak on a fitting. On mine I found that the fitting where the hole in the black plastic that the water flows through to get into the stainless steel tank needed to be repaired with some silicone sealant to fix the leak. Still making some coffee!

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