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On a Keurig, blinking brew buttons almost always mean "ready, pick a size," while a group of lights flashing together is an error code, and the code depends on the model. On a K-Classic, the blue Add Water light, red Heating light and Small Mug button all flashing at once means water is not getting from the reservoir into the brewer, and the fix is to reseat the tank and press the Small Mug button. On a K-Elite or K-Duo, all of the size buttons blinking together is the pattern Keurig's own guide says to call customer service about, with no button combination that clears it.
The blink that is not a problem
After you lower the handle on a pod, the brew buttons flash to tell you the brewer is ready. The K-Classic guide describes the blue brew buttons flashing once the handle is pushed down securely, and the K-Slim and K-Mini Go guides say the three cup-size buttons blink so you can choose a size, then press the blinking BREW button. If nothing happens when you press a size, the handle is not fully down. Lift it and lower it again.
Documented light patterns by model
| Model | What is flashing | What it means | What Keurig's guide says to do |
|---|---|---|---|
| K-Classic | Blue Add Water, red Heating and Small Mug button, all at once | Water is not moving from the reservoir into the brewer | Remove the reservoir, clean it, fill to (not past) MAX FILL, reseat it, press the flashing Small Mug button. If it happens twice more, call Keurig |
| K-Classic, K-Elite, K-Duo | Add Water stays lit after refilling | Reservoir not seated or not reading | Reseat the reservoir in its base; if the light stays on, contact customer service |
| K-Elite | 4, 6, 8, 10, 12 oz and ICED lights all solid at once | Brewer stalled mid-cycle | Lift the handle, remove the pod, close it, put a large mug on the tray, press power once. It may dispense hot water |
| K-Elite | 4, 6, 8, 10, 12 oz lights all blinking together | Internal fault | Contact customer service |
| K-Duo, K-Duo Essentials | All buttons blinking together | Internal fault | Contact customer service |
| K-Slim, K-Mini Go, K-Elite | Size buttons or BREW blinking on their own | Ready to brew | Pick a size, press BREW |
| K-Mini Go, K-Slim | DESCALE light on | Descale reminder | Run the full descale procedure in descale mode; the light only clears when it finishes |
The K-Classic three-light flash
The most searched Keurig error has a specific answer in the K-Classic Use and Care Guide. When the blue Add Water light, the red Heating light and the Small Mug button flash simultaneously, Keurig's instruction is: completely remove the water reservoir and clean it, make sure it is filled to and not beyond the MAX FILL line, return it to the brewer and make sure it is seated properly, then press the flashing Small Mug button. If you have done this twice and the pattern persists, contact customer service. Note that Keurig has you clean the reservoir, not just top it up.
All lights blinking together
On the K-Elite, the Use and Care Guide draws a line between two states that look similar. If the 4, 6, 8, 10, 12 oz and ICED lights are all on at the same time, the fix is to lift the handle, remove any pod, close it, place a large mug on the drip tray and press the power button once; the brewer may dispense hot water and then reset. If those five size lights all blink simultaneously, the only instruction is to contact customer service. The K-Duo and K-Duo Essentials guides say the same thing about all buttons blinking together. Keurig does not publish a reset sequence for that state, so any "hold these two buttons" advice you see for it is guesswork.
No error lights, but it will not brew
Small brewers refuse to start when the tank is low. The K-Slim guide says a minimum of 6 oz of water is required to brew, and tells you to add 2 oz more and press brew again, repeating until it dispenses. The K-Mini Go guide says the tank must be at least half full. If a brew stopped short, both guides give a purge: on the K-Slim, power off, then hold the brew button and the 12 oz button for 5 seconds until water dispenses; on the K-Mini Go, hold the 12 oz and BREW buttons for 3 seconds until all the water purges. Then run a normal brew.
The descale light
The DESCALE light is not an error, but it will not go away on its own. The K-Mini Go guide is explicit: in order for the DESCALE light to turn off you must enter descale mode (hold the 8 oz and 12 oz buttons together for 3 seconds) and complete the full descaling procedure, including the fresh water rinse until the ADD WATER light comes on. The K-Slim guide sets the interval at every 3 months. If you already descaled and the light is still on, our descale light won't turn off guide walks through the rinse counts by model.
You will need genuine or pod-machine-safe descaler for that procedure: Keurig descaling solution on Amazon.
Related reading
Sources
Keurig K-Classic Series Use and Care Guide (PDF)
Keurig K-Elite Use and Care Guide (PDF)
Keurig K-Duo Special Edition Use and Care Guide (PDF)
Keurig K-Duo Essentials Use and Care Guide (PDF)
Keurig K-Slim Use and Care Guide (PDF)
Keurig K-Mini Go Use and Care Guide (PDF)
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