Keurig Blinking / Flashing Light Errors

In this post, I describe the most common Keurig machine blinking light alerts and what you can do to fix them. If all lights on your Keurig coffee maker (add water, heat and medium cup size buttons) are flashing, the issue likely is the charcoal filter in your tank. If ADD WATER light is on, start by emptying the water tank, cleaning and refilling it.