Ninja Coffee Maker Brewing Weak Coffee? 5 Fixes (Coffee Bar, DualBrew Pro)

Quick Diagnosis: Why Is Ninja Coffee Weak?

Ninja's owner's guides give a two-step answer to "weak coffee": add more coffee grounds next time, and if it's still weak, switch to Rich Brew. The amount matters more than most people expect. Ninja's measuring charts go by brew size, so a full carafe on a Coffee Bar needs 4-6 big scoops (8-12 tablespoons), not a couple of scoops.

The DualBrew Pro guide spells out the trade-off: "More scoops result in stronger coffee but slightly lower volumes, fewer scoops result in weaker coffee and slightly higher volumes."

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Fix 1: Use Ninja's Measurements for the Size (Works About 35% of the Time)

Ninja's charts use level scoops of ground coffee. The amount depends on the size, not the brew style, so a Cup of Classic uses the same grounds as a Cup of Over Ice.

Ninja Coffee Bar (CF091 series):

DualBrew Pro (CFP300 series):

1. Start at the top of the range for your size if it tastes weak.
2. Don't go past the maximum: the Coffee Bar takes at most 12 rounded tablespoons (6 Ninja Big Scoops). More can overflow.
3. Decaf: the DualBrew Pro guide says to use fewer scoops of decaf to prevent overflow.

Time: None
Cost: Free
Success Rate: About 35%
Difficulty: Easy

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Fix 2: Switch to Rich Brew (Works About 25% of the Time)

Ninja's second step for weak coffee is Rich Brew, "a stronger, more concentrated cup". It uses slightly less water than Classic with the same grounds, so it comes out stronger and a little smaller.

On the DualBrew Pro, a Full Carafe is about 55 oz on Classic and 47 oz on Rich.

For something stronger still, the Coffee Bar's Specialty Brew makes a 4 oz concentrate for milk drinks, and Cafe Forte an 8 oz cup, each with 2 big scoops.

Time: None
Cost: Free
Success Rate: About 25%
Difficulty: Easy

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Fix 3: Check the Grind, Filter and Roast (Works About 15% of the Time)

• Use medium grind. All three guides recommend it. The DualBrew Pro guide says not to use fine or espresso grind, and fine grounds can make the basket overflow.
• CE251 (12-Cup Programmable): for stronger coffee, Ninja suggests Rich Brew, darker-roast grounds, or the permanent filter instead of a paper filter.
• Paper filters: use a #4 cone filter folded along its seams, with the permanent filter taken out first. Never use both at once.
• Too strong instead? Ninja's answer is a coarser grind first, then fewer grounds.

Time: None
Cost: Free
Success Rate: About 15%
Difficulty: Easy

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Fix 4: Fill the Cup With Ice for Over Ice Brew (Works About 12% of the Time)

Over Ice Brew brews hot coffee over ice. Ninja's guide says the cup, travel mug or carafe must be "filled all the way to the top with ice cubes". Ninja lists this under "Over Ice Brew is not cold": with too little ice, the coffee comes out warm. Use the same amount of grounds as for a hot brew of that size.

Time: None
Cost: Free
Success Rate: About 12%
Difficulty: Easy

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Fix 5: Keep the Brewer Clean, Then Call Ninja (Works About 8% of the Time)

Ninja's safety instructions say to clean the system on a weekly basis, and to run the Clean cycle when the CLEAN light comes on (Coffee Bar) or the Clean indicator lights (DualBrew). Rinse the brew basket and permanent filter after every use. Our Ninja clean light guide covers the Clean cycle step by step.

If coffee is still weak with the right amount of medium-ground coffee on Rich Brew, contact Ninja: 1-877-646-5288. The DualBrew Pro and CE251 have a one-year limited warranty.

Time: About 1 hour for a Clean cycle
Cost: White vinegar or Ninja descaler
Success Rate: About 8%
Difficulty: Easy

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When the Coffee Just Can't Be Fixed

Contact Ninja if a DualBrew shows "Er" with a number, or if the coffee stays weak with the measured amount, medium grind and Rich Brew. Some water left in the reservoir is normal: the markings are minimum fill lines, and the brewer only uses what the chosen size needs.

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Keep Your Ninja Brewing Strong

• Measure by size, with level scoops, using the chart for your model.
• Choose Rich Brew when you add milk.
• Medium grind, fresh beans, and one filter at a time.
• Fill the cup with ice for Over Ice Brew.
• Clean weekly, and descale when CLEAN lights up.

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FAQ

What's the difference between Classic and Rich on a Ninja?

Rich Brew uses slightly less water than Classic with the same grounds, which gives a stronger, more concentrated cup. On the DualBrew Pro, a Full Carafe is about 55 oz on Classic and 47 oz on Rich.

Can I use espresso-fine coffee in the Ninja?

Ninja recommends medium grind. The DualBrew Pro guide says not to use fine or espresso grind, and fine grounds can make the brew basket overflow.

How many scoops for a full carafe on a Ninja Coffee Bar?

4-6 big Ninja scoops, or 8-12 tablespoons. The maximum is 12 rounded tablespoons (6 big scoops). On the DualBrew Pro, a full carafe takes 4-7 big scoops (8-14 tablespoons).

Why is my Ninja iced coffee weak?

Over Ice Brew brews hot coffee onto ice, so Ninja says the cup or carafe must be filled to the top with ice. Use the same grounds as a hot brew of that size.

Does the Ninja DualBrew Pro make espresso?

No. The DualBrew Pro has a grounds side and a pod side (with the Ninja Pod Adapter). Its concentrated option is Specialty Brew, about 4 oz. Its guide says not to use espresso grind.

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Related Ninja Guides

• Ninja Coffee Bar Brewing Slow
• Ninja Coffee Bar Clean Light Won't Turn Off
• Ninja Coffee Bar Troubleshooting

Sources: Ninja Coffee Bar CF091 series owner's guide, Ninja DualBrew Pro CFP300 series owner's guide, Ninja 12-Cup Programmable Brewer CE251 owner's guide.