Ninja Hot & Iced Coffee Maker Not Working? 6 Fixes (CM371)

Read the Clock Before You Touch Anything

When a Ninja Hot & Iced coffee maker is not working, start with the clock display. Add Wtr means it ran short of water, CLOG means heavy scale in the boiler and needs a clean cycle now, and StOP means the brew was cancelled. Five beeps at the start usually mean the Drip Stop is closed. Open it and press your brew style again.

This page covers the two machines in Ninja's Hot & Iced owner's guide: the CM360 with a 50 oz reservoir and the CM371, sold as the Hot & Iced XL, with a 60 oz reservoir. Both have a swinging brew basket, a single-serve cup platform, a Multi-Serve dial, four brew styles (Classic, Rich, Over Ice and Cold Brew) and an Intelligent Warming Plate.

Two habits from other Ninja brewers don't carry over. This one says CLOG where several Ninja models say CLn, and its warming plate has three heat settings. Everything below comes from Ninja's CM360 & CM371 Owner's Guide.

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Try This First

• Look at the Drip Stop lever. If it's closed, the machine won't dispense. A lit Drip Stop indicator confirms it.
• Lift the reservoir off and seat it again. Fill it no higher than the Full line, with water only.
• Check that the brew basket has clicked shut. Swing it back until it clicks into place.
• Check the carafe is empty before you brew. Ninja warns that starting with liquid already in the carafe causes an overflow.
• Look for a flashing clock. That only means the time was lost after unplugging or a power cut. Press H/M to set it.

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What Your Hot & Iced Is Telling You

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Fix 1: Act on the Clock Message (Works About 25% of the Time)

The clock spells out most faults, and each one has a single documented answer. Ninja's guide lists no numbered code you can fix at home.

Signs it's this one: a word on the clock in place of the time, and the brew has stopped.

1. Add Wtr: add fresh water to the reservoir, then press the brew style you had selected. The brew resumes.
2. StOP: a second press of a brew button cancels the brew. Press the style again to start over.
3. Er plus a number: call Customer Service at 1-877-646-5288. Ninja doesn't publish what the numbers mean, so don't trust a list that claims to.
4. Water left in the reservoir afterward is normal. The fill lines are minimums, and Ninja leaves some behind so the brewer never runs dry.

Time: 2 minutes
Cost: Free
Success Rate: About 25%
Difficulty: Easy

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Fix 2: Open the Drip Stop (Works About 25% of the Time)

The Drip Stop is a manual lever that closes off the brew basket. Left closed, it holds coffee in the basket, so the machine looks as if it won't brew.

Signs it's this one: five beeps when you start, the Drip Stop indicator on, or a brew that stops and later beeps at you.

1. Move the lever to the open position.
2. Select your brew style again.
3. If you closed it mid-brew to pour a cup, return the carafe promptly and reopen it.

Timing matters here. If the lever stays closed during a brew, the machine pauses, reminds you with a beep after 1 minute and cancels the brew after 6 minutes. Never take the vessel away during a brew without closing the Drip Stop first.

Time: 1 minute
Cost: Free
Success Rate: About 25%
Difficulty: Easy

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Fix 3: Run a Full Clean Cycle (Works About 20% of the Time)

Calcium scale builds up in the boiler, and hard water speeds it up. CLEAN lights when a cycle is recommended. CLOG is the stronger version: run a clean cycle before you try to brew again.

Signs it's this one: CLEAN or CLOG on the panel, or coffee that has started tasting off.

1. Select the Full Carafe size and put the empty carafe under the brew basket.
2. Fill the reservoir with descaling solution mixed as its package directs, up to the Full line. Or pour white vinegar to the Travel Mug line (16 oz) and top up with water to the Full line.
3. Press CLEAN. The clock counts down about 60-75 minutes, with long pauses built in.
4. Leave the carafe in place for the whole cycle.
5. When the machine beeps and shows End, empty the carafe and wash the reservoir with warm, soapy water.
6. Refill with fresh water to the Full line and run a Full Carafe, Classic brew with water only. Discard it and clean the carafe.

Water alone won't descale it, and a cancelled cycle leaves the job undone. If you do cancel, you still need the rinse in steps 5 and 6. Ninja says only white vinegar should be used if you choose vinegar.

CLEAN still on after a full cycle? Ninja says you may need a second cycle to remove more buildup.

Time: About 90 minutes with the flush
Cost: Free with vinegar you have, or the price of descaler
Success Rate: About 20%
Difficulty: Easy

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Fix 4: Stop Overflows and Leaks (Works About 15% of the Time)

Most overflow on this machine comes from coffee or filters that hold water back in the basket. Where the water appears tells you which row of Ninja's guide applies.

Signs it's this one: grounds and water around the basket, a flooded cup, or water on the counter.

1. Basket overflowed: rinse the filter holder, because its base can clog. Use medium-grind coffee and follow the Smart Scoop marks. For decaf, use fewer scoops.
2. Never use a paper filter and the permanent filter together. Ninja says that backs up water and grounds.
3. Cup or mug overflowed: match the vessel to the size. Ninja asks for at least a 12 oz cup for Cup, 14 oz for XL Cup, 16 oz for Travel Mug and 20 oz for XL Travel Mug.
4. Drop of water under the reservoir: a small amount can sit in the reservoir valve. Wipe it with a dry cloth.
5. Leak from the bottom of the brew basket: check that all the parts are assembled securely and that the Drip Stop is closed.
6. Leak from the bottom of the machine: stop and call 1-877-646-5288.

Time: 5-10 minutes
Cost: Free
Success Rate: About 15%
Difficulty: Easy

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Fix 5: Set Up the Warming Plate if Coffee Isn't Hot Enough (Works About 10% of the Time)

Coffee temperature is a recurring complaint in owner reviews of this machine, but Ninja's guide has no "not hot enough" row and prints no brew temperature. What it does document is the warming plate, and the plate has limits that are easy to miss.

Signs it's this one: a carafe that cools while it sits, or a plate that never seems to come on.

1. Check what you brewed. The plate turns on automatically only for carafe sizes in Classic or Rich. Over Ice and Cold Brew are meant to run cool over a vessel full of ice.
2. Hold WARM until the clock flashes the warming time. Turn the dial to set up to 4 hours, then press WARM.
3. The clock now shows the temperature. Turn the dial to High and press WARM. Settings save after 5 seconds of inactivity. The default is 2 hours on Medium.
4. If the time is set to 0 hours, the plate won't switch on automatically during a carafe brew, and the temperature menu is skipped. That's the first thing to check on a "dead" plate.
5. To turn the plate on at any time, set the dial to a carafe size and press WARM.
6. If the HOT SURFACE indicator never lights and the plate stays cold after those steps, call Ninja.

Our Ninja coffee maker not heating guide covers how the other Ninja brewers handle heat.

Time: 2 minutes
Cost: Free
Success Rate: About 10%
Difficulty: Easy

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Fix 6: Run the High-Altitude Calibration (Works About 5% of the Time)

Water boils at a lower temperature at altitude. Ninja says skipping this calibration in a high-altitude area causes excessive steaming during brewing.

Signs it's this one: heavy steam while brewing, and you live at altitude or have recently moved.

1. Fill the reservoir to the Full line.
2. Put the empty filter holder in the brew basket and an empty vessel under it.
3. Press and hold CLASSIC and OVER ICE together until the clock shows CAL.
4. When the machine beeps and shows End, discard the water.

The calibration stays saved through a power cut or unplugging. Pressing Classic, Over Ice, Cold Brew or Power cancels it while it's running.

Time: One brew cycle
Cost: Free
Success Rate: About 5%
Difficulty: Easy

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Normal Behavior That Looks Like a Fault

• The brew stops and goes quiet, then restarts. Ninja designed this to saturate the grounds evenly.
• It takes a while. Brew time varies between 4 and 20 minutes. Full Carafe, Rich and Cold Brew take longest.
• Cold Brew doesn't start right away after a hot brew. It can take a minute or two. Ninja suggests running Cold Brew before any hot brews for best output.
• Over Ice and Cold Brew make far less coffee. On the CM371, a Full Carafe is about 22.4 oz of coffee against 54.4 oz for Classic, because the vessel is full of ice.
• No beep at the start. The unit beeps only when a brew finishes.

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CM360 vs CM371

The volumes come from Ninja's own charts and can vary a little. Ninja notes that functions and some sizes vary by model.

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When DIY Won't Work

Stop and call Ninja at 1-877-646-5288 if:

• Er and a number appears on the clock.
• Water comes from the bottom of the machine.
• There's no power on a working outlet. Ninja's guide has no row for this and says not to use extension cords.
• You smell burning, or the carafe is cracked. Unplug the machine. Ninja says not to use a cracked or scratched carafe, or one with a loose handle.

Warranty: one year from the date of purchase, for the original owner, on purchases from authorized retailers in North America. You'll need your receipt to start a claim by phone. SharkNinja covers sending the unit in and charges a $20.95 fee (subject to change) to ship the repaired or replacement unit back. Unauthorized repairs aren't covered.

Repair or replace: the guide lists no internal parts and sends all servicing to an authorized provider. Replacement filters and accessories are at ninjaaccessories.com. Out of warranty, ask Ninja for a price before paying for anything.

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Keep It Brewing

The glass carafe, brew-through lid, permanent filter, filter holder, reservoir, lid and scoop are dishwasher safe. A thermal carafe is not.

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FAQ

How do I reset a Ninja Hot & Iced coffee maker?

There's no documented reset. Unplugging only clears the clock, and Ninja's guide has no button sequence for a fault. For CLOG run a clean cycle, and for an Er number call Ninja.

What's the difference between CLEAN and CLOG?

CLEAN is a recommendation, so the machine keeps brewing. CLOG means Ninja's system has detected heavy scale in the boiler and wants a clean cycle right away, before you try another brew.

Can I put ice in the reservoir for iced coffee?

No. Ninja says not to add ice to the reservoir. Fill your vessel to the top with ice instead and place it under the brew basket. Don't use ordinary glassware for Over Ice or Cold Brew, although the Ninja glass carafe is safe.

Why does my Hot & Iced beep after I've poured a cup?

The Drip Stop is probably still closed. Ninja's machine beeps as a reminder after a minute, and it cancels the brew at 6 minutes if you leave it closed. Open the lever and the brew finishes.

Do I need to prime it when it's new?

Yes. Run a Full Carafe, Classic brew with water only and no coffee, then discard the water. Altitude users should run the calibration brew before their first coffee as well.

Does Delay Brew work if the machine is off?

No. Ninja says the unit must stay on for Delay Brew to work, so don't power it off or unplug it after setting a time. The Drip Stop must also be open.

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Related Ninja Guides

• Ninja Specialty coffee maker not working: the CM401, a close relative with a frother and a CLn message
• Ninja Coffee Bar error codes: lights, beeps and Er codes on other Ninja brewers
• Ninja Hot & Cold Brewed System not working: the coffee and tea brewer
• Ninja coffee maker not heating
• Ninja won't brew

Sources: Ninja Hot & Iced Coffee Maker with Rapid Cold Brew Owner's Guide, CM360 & CM371.