Turns out I finally called Keurig and explained the problem (says to add water when water container is already full...) and they told me that it was most likely an issue with the water container. They sent me a new water container about a month ago and it looks as though the problem has been solved!! Solution: Call Keurig and get a new water container!!!!
There's a magnetic float in the water container and a magnetic reed switch behind the plastic inside the keurig. The magnet on mine eventually wouldn't close the reed switch consistently. First I melted a square hole in the side of the keurig and repositioned the switch directly behind the magnetic float. For some strange reason it's about 3/8 inch offset. No joy, the reed switch was still intermittent. Next I placed a spacer behind the reed switch to move it closer to the magnetic float in the water continer. It only moved it about 1/8 inch closer but seems to be working consistently now, joy. Decent design but they probably sourced really bad magnets from china or something. Alternatively you could try and beef up the magnetic float in the water container. Good luck my friends!
If you look on the side of the water reservoir there is a float disc. this magnetic disk tell the keurig the unit is empty or full, sediment likes to collect in there. if yours is saying add water empty the reservoir and check that the disc is down, add water and make sure it floats to the top. my problem was opposite, would run out of water and the coffee make kept going(float stuck up, thought it was still full)
I am having the same problem. I am going to try to de-scale and see if that helps?
SOURCE: Keurig after filling cup fails to pull water from reservoir
There is a major design defect with all the newer Keurigs, including the B60 and the B70/B77. My understanding is that Keurig has redesigned the pump mechanism that extracts water from the reservoir and into the brewer (there's a second pump that forces the hot water through the K-cup, and it's not involved). They are now using a small DC motor and impeller pump, which is much quieter (to address complaints in many reviews) but the new design just doesn't work.
It appears that air gets into the system, and the new pump isn't strong enough to "self-prime" in this case. So the pump motor runs and runs without water going through it, and eventually turns itself off so it doesn't burn out (it should usually take only a few seconds to fill the internal tank). Many people think the problem centers around the 'check valve' in the base of the unit, just below where the clear reservoir seats itself: Theory is that the tiny pump can't pull hard enough to open the check valve to let water flow, especially when there's any air in the system.
I've had two B77 units already myself, and both have failed this way within only a few weeks. FWIW, the workaround I discovered is to turn the unit on, and lift up the water-filled reservoir about 1-2" as if you're removing it. Then jam it back down into place, hard and fast. Doing this injects just enough pressure into the system to open the check valve, and if the pump motor is running, you'll hear (and see) it immediately start transferring water from the reservoir to the chamber. You'll often have to do this between each cup you brew, and again when you first turn on the system.
There are hundreds of similar reports all over the Internet about this issue, and apparently no real solutions from Keurig yet (I don't even know if they're acknowledging the problem). Other symptoms include brewing half-filled cups of coffee, as others on this forum have reported.
I suggest everyone call Keurig's customer service and file complaints about this until they come up with a fix. Don't let them tell you it's a problem with your AC power or your hard water (they'll try excuses like tthose first). And until they redesign this, there's not much point in having them ship you a refurbished replacement for your brand-new machine, because chances are it will quickly fail just like your old one.
Testimonial: "This is my problem to a "T". I will contact Keurig directly. I love the brewer just wish it would work."
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I am having the same problem...
Exact same problem! If I jiggle it the right way, I can get it to work, but there must be a "fix" for this...is it a clogged line or something? Help!
I found a solution- call Keurig, they will send you a new unit.
the add water light is on even though chamber is full. The heater is not heating water
That happened with my brand new machine. I took out the water filter from the reservoir and it started working. I put the water filter back in a little later and it is still working.
ADD WATER, HEATING, SMALL CUP ARE ALL
FLASHING. I don't think the magnet in the float disc is strong enough. Either that or loses its strength over time. I took one of those flat refrigerator magnets, cut it to the size of the magnetic float disc and taped it onto the side of the reservoir where the disc is when water is full. Mine has been working ever since. KNOW THAT YOUR ADD WATER LIGHT MAY NOT WORK PROPERLY. KEEP THE RESERVOIR FULL!!!!!!! My Keurig is out of warranty.
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