Bunn Coffee Maker Leaking? (Common Causes & How to Fix It) (2024)

Is your beloved Bunn Coffee Maker leaking? As much as we all love these coffee makers, a common struggle that people have over time is that their coffee maker begins leaking water. If this is happening to you, then you are in the right place

In this article we will discuss the common causes of the leaking and give you simple, step-by-step directions so you can quickly fix it. So, let’s get started.

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Most Common Causes

Damage to Seals & Gaskets

The most common cause of your Bunn Coffee Maker leaking water is that the silicon seal between the water reservoir and water tank gets damaged. Over time, with consistent use, you will notice the seal starting to melt and diminish.

This process is known as Planned Obsolescence, and it is a normal occurrence. In order to fix this problem, you will need to buy and replace the silicon seal. Not sure how to do it. Don’t worry, the article will give you directions below.

Mineral Deposit Buildup

This is the second most common cause of your coffee maker leaking water. If you find that the silicon seal is working properly, then you should next check to see if there is mineral buildup inside of it.

This happens when you don’t regularly clean and maintain the machine. This is especially true if you have hard water in your home. The mineral in the water, over time, build up and cause issues for the coffee maker. You will notice that water starts leaking out of the bottom and sides of your machine.

It is important that you clean your coffee maker regularly. You should also do a deep cleaning process every couple of months to keep the machine well-maintained and functioning properly. You will find step-by-step directions for how to do this later in this article.

Improper Usage

If you are not using your Bunn Coffee Maker properly, then it will cause you problems down the road. This is the hardest problem to deal with because it affects the internal circuitry inside. Most people that have this problem end up replacing the machine. Fortunately, this is the least common cause, so we won’t be discussing this one any further.

Two Solutions to Fix It

After you complete your inspection, you should understand why your Bunn Coffee Maker is leaking. As we discussed above, the two main causes are broken seal or mineral deposit buildup inside the machine. Here are the simple directions you need to fix both of the issues.

Replace the Broken Seal

If you find the cause of your Bunn Coffee Maker leaking is a broken seal, then you will need to get a replacement. Don’t worry, you can easily get one from Amazon. Once you receive it, you will need to replace the old broken one with the new one. Here is all the information you need to do so.

Things You Need


1. Make sure the Bunn Coffee Maker is unplugged.

2.Use the screwdriver to remove the screws on the top of the Bunn Coffee Maker to open it up.

3. Remove the plastic cover, then carefully remove the plastic plunger inside. Be sure to clean it properly once it is removed.

4. Once the plunger is removed, you will see the damaged seal inside.

5. Carefully remove the broken seal and replace it with the new one you purchased. Make sure it fits on properly or it won’t step the water from leaking out.

6. Once you have the seal on properly, use the Aqueon Silicone Sealant to ensure that your seal is waterproof and strong. This will make the seal long-lasting for you.

7. Give the sealant time to fully dry.

8. Pour a little water inside to see if any water leaks from the bottom or sides of the machine. If you don’t see any leakage occurring, then you know you fixed it properly and you are good to go.

9. Replace the plunger and plastic cover.

10. Enjoy your next cup of coffee!

Remove the Mineral Buildup

If you find that your coffee machine is leaking due to mineral buildup inside of it, you will need to do a deep clean to remove it. You should be doing this every couple of months to prevent the build up from occurring. Follow these instructions to do so.

Things You Need

  • White Vinegar
  • Dish Soap
  • Toothpick


1. Be sure you have water in your water tank.

2. Pour 4 cups of white vinegar into the top of your machine, be sure your coffee pot is in place.

3. Start the brewing cycle and wait for your coffee carafe, or pot, to fill up.

4. This will move the water from the tank to the pot, and the white vinegar will go into the water tank.

5. Pour the water out of the coffee pot, turn off the machine, and unplug it from the wall.

6. Let the white vinegar sit in the water tank for two hours.

7. After two hours, remove the brew funnel and the spray head (located directly above the coffee pot).

8. See if any mineral deposits are stuck in the spray head. If so, then use the toothpick to remove them.

9. Rinse the spray head off with dish soap and warm water.

10. Fill the top of your coffee maker with water.

11. Be sure your brew funnel and coffee pot are back in place and start a brewing cycle. This will flush the vinegar out of the system.

12. Repeat the water cycle a few more times, until you no longer smell the white vinegar.

13. Once the process is complete, remove the brew funnel again and put the spray head back on your machine.

14. Enjoy a pot of hot, delicious coffee!

Final Thoughts

While it is a common issue to have your Bunn Coffee Maker leaking. It is also simple to fix the problem. The two main causes are a broken seal and mineral buildup.

Hopefully, this article has helped you to solve both of these problems, so that you can get back to enjoying your coffee in peace.

Be sure and do a deep cleaning every few months to keep your coffee machine working properly for you.

Related Articles:

How to Clean Bunn Coffee Maker
How long can coffee sit out?
Does Coffee Expire? (and Is It Safe to Drink?)

Bunn Coffee Maker Leaking? (Common Causes & How to Fix It) (2024)
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