We have had our B40 Keurig for over a year. Has been a great machine. This week, everything set up properly but when the lights blink for a large or small cup, the small cup light doesn't come o

thats usual

if you have not run for a week or two you may need to reprime it, check manual for process.

THey willwhen the handle is in the down position well engaged.

1. There is some confusion over models. I've seen "B40" models and instructions with only one size cup button, both labeled B40. I own one stamped "B40" on the bottom, and it has two buttons -- small and large. FWIW, small = 8 oz, large = 10 oz.

2. These reset instructions from another site seemed to do something
What to Do If Your Keurig Won Brew Cup Barista

So.. this is what I did that worked for mine: 1) Hold down Auto-Off and LARGE cup at same time. (all lights should hold steady ON) 2) press SMALL cup while still holding Auto-Off and LARGE cup 3) Release all three, press LARGE cup again.. all lights should go off. 4) Unplug for about 5 - 10 second, plug back in. SHOULD WORK!

3. On *_my_* B40, remove the K-cup, close the door, fill the reservoir. Unplug and replug the B40. All lights should be off.

Pressing "Auto Off" and "Large Cup" together will turn on 3 lights (Heating, Add Water, Power) for about 3 seconds. Doesn't matter how long the buttons are pressed or what order they are released.

I tried lots of add-on combinations: e.g. press button x, press x multiple times, press x while lights are still on, press x after lights are off, press buttons x and y together, press x then y, press x and/or y while still holding Auto and Large, release Auto but not Large and press x, etc.

Nothing gave any confirmation that a reset was accepted. All lights always turned off after 3 seconds. Maybe Reset is only 1 step, i.e. Auto+Large together?

Keurig B40 User Manual

Hi,

There is air in the lines and it is blocking the water flow...
Here is a tip that will help you getyour Keurig to prime...

Keurig CoffeeBrewer will not prime
heatman101;'

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You, have internal leakage.....DO NOT PLUG, IT IN AGAIN, Call Keurig tell them what is happining with your B-40, Your, not the first owner of a B-40 with this problem, And you wont be the last.....sorry to say. !!!

After trying everything that I have read about I finely made up my mind that this thing could not be fixed so I decided to just push all the buttons and hold them down for awhile when I let them go the lights went off and now it is working just fine.

let it blink for about 15 minutes, then adjust each one of the settings, then turn it off and back on, for some reason it stops flashing and will work. Warning, after doing this for about a week, mine now has no power at all. It is plugged in and the outlet works and there is no power going to the machine, it is not even a year old!

If the machine is new, call keurig.. There telephone number is on the web site. They are warrented for 1 year.