Keurig K-Slim Error Codes? What Each Light Means

Does the K-Slim Have Error Codes?

No. Keurig's K-Slim Use & Care Guide lists no error codes. The K-Slim's control ring has an ADD WATER indicator, a DESCALE indicator, three cup sizes (8, 10, 12 oz) and the brew button, plus a separate power button. Each light has a plain meaning in the guide. None of them is a fault code.

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K-Slim Lights at a Glance

The K-Slim has no temperature setting, no hot-water button and no Strong button.

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Fix 1: ADD WATER Won't Clear, or It Won't Brew

What the guide says (Brewer Will Not Brew): "A minimum of 6oz of water is required to brew. Add an additional 2oz of water to the reservoir to ensure the minimum fill level has been met, then press the brew button. Repeat until the brewer begins to dispense."

Time: 1 minute
Cost: Free
Difficulty: Easy

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Fix 2: DESCALE

Descale every 3 months, and finish the whole procedure.

1. With the brewer powered off, hold 8 oz + 12 oz for 3 seconds until DESCALE turns solid.
2. Pour in the whole bottle of Keurig Descaling Solution plus a bottle of water. Use a large ceramic mug and no pod.
3. Press the flashing brew button, and repeat until ADD WATER lights.
4. Empty the reservoir, fill it with fresh water to MAX, and repeat until ADD WATER lights again. The brewer then exits Descale Mode.

It takes 15-20 minutes. Foam is normal.

Heavily scaled (little output, then air): turn it off and unplug it. Discard the solution, rinse, refill, and repeat the fresh-water rinse. If that doesn't work, leave it unplugged 30+ minutes.

Time: 15-20 minutes
Cost: Keurig Descaling Solution
Difficulty: Easy

More: Keurig descale light won't turn off.

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Fix 3: Partial Cup

What the guide says: "Power the brewer off. Press and hold the brew button and 12oz button for 5 seconds until water starts dispensing. Then release and let the water purge. Discard the contents into the sink. Press the power button to restart."

Then clean the exit needle and the pod holder, and descale. After two descales, contact Customer Service.

Time: 2 minutes
Cost: Free
Difficulty: Easy

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Fix 4: Grounds in the Cup

Clear the exit needle (pod holder out, funnel off, paper clip) and both holes of the entrance needle under the lid. Then run two water-only brews.

⚠️ Caution: sharp needles; don't put your fingers in the pod holder.

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Fix 5: Nothing Lights Up

• Auto Off switches it off 5 minutes after the last brew. Lift and lower the handle to wake it.
• Plug it into its own grounded outlet.
• After freezing temperatures, let it warm up for at least 2 hours.
• Still no power: contact Keurig Customer Service.

High Altitude: hold brew + 8 oz for 3 seconds.

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FAQ

What does the DESCALE light mean on a K-Slim?

Steady DESCALE means Descale Mode is active. Finish the full procedure, including the fresh-water rinse.

Why won't my K-Slim brew with water in it?

It needs at least 6 oz. Add 2 oz more and press brew, then repeat until it dispenses.

How do I reset a Keurig K-Slim?

The guide has no reset. The 8 oz + 12 oz hold starts Descale Mode, and brew + 12 oz purges a partial cup.

Does the K-Slim have a temperature setting?

No. Its only controls are power, brew and three cup sizes.

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Related Keurig Guides

• Keurig Error Codes Guide
• Keurig Not Working?
• Keurig Add Water Light Won't Turn Off?
• Keurig Clogged Needle?

Sources: Keurig K-Slim Use & Care Guide.