Question about Keurig B100 Coffee Maker

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Using Burnzy's solution for little/no water

It was great having the picture of the side. But before I disconnect the check valve, I want to make sure I have it properly identified. Is the check valve the clear white assembly that is located below the bent tube out of the tank unit and above the bent tube going into the white/silver cylinder ?
Do I let the pump run the full "cup" cycle before turning it off, to get all the water out of it or just a few seconds?

Being a semi-fixit girl, I just like to make sure BEFORE I dismantle the wrong part. Sorry guys for a probably a "stupid" question.

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My picture had arrows with labels indicating the location of the pump and the check valve, but they disappeared when I posted it. Anyway, It sounds like you have located the check valve that causes most of the brewing problems. The valve is white and semi-transparent with a spring in the middle. When this valve fails, water flows from the tanks and down into the air pump (white/silver cylinder) which disables the pump.

I have repaired three of these now, and two needed new check valves, but only one just needed to be cleaned. I found the valves on ebay for $7.00 (try seller; "Dartbikes"). if you do need to replace the valve, make sure that you purchase a high heat (275+ deg F)rated 1/4" to 1/4" check valve. The new valve will not be identical to the original, so will be adding the valve under the original. This should fix your problem... however, one of the units I fixed had a frozen pump which was caused by the water that got into it. I was able to open the pump and free the frozen parts with silicone, then it worked fine again.

As for your second question, no you don't need to run a cycle or drain it before opening the unit. However, you should unplug the machine to prevent getting shocked. Though, you may need to power in on a few times while it's open to test it. So if you do, don't touch any terminals or exposed wires.

Good luck and let me know if you still have questions, Erik

Posted on Feb 23, 2008

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KeuSymptom: keurig B100 coffee maker not brewing. If your brewer sounds like it should be brewing but little or no coffee comes out, the problem may be a simple malfunctioning check valve, located on the right hand side of the unit under the plastic cover. If the check valve is clogged or fails, water from the tank leaks into the air pump (located just below the valve) disabling the pump.

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B100 Keurig


The pump is on the right side, has two wires coming out of it, and is connected to the check valve with a silicone hose. When you run a cycle, to brew a cup of coffee, that pump should be pumping air out, which pushes the hot water out of the tank.

So to test it, disconnect the hose and run a cycle to listen and feel for air coming from the pump. If it is not working (frozen due to the water permitted to enter from the failed check valve), you must remove it to dismantle the top part of the pump.

Getting the pump out is a little tricky... as you will see. There is only one philips head ***** holding it in, however, it is not easy to get to. I used a 90 degree angled *****driver, which worked well, after trying many other options.

Once you get it out, remove the three philips head *****s on the top of the pump right near where the hose was connected. Then separate the two sections of the pump. Inside there will be a fitting in the center that spins to actuate the pump. This fitting must be freely moving. If it is not, use WD-40 or a similar product to free the motor.

Clean up all the WD-40 from inside the chamber (so your coffee does not taste like oil) and reassemble. Then test it by running a cycle. The pump should now be working, if not repeat the process until the pump operates.

Since my last post, I have fixed another B100 that had the same issue. Keurig will not sell you a replacement pump or check valve, so you must repair that pump.

Good Luck, I hope this works for you. Erik

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