I also own a Cuisinart DGB-900BC. This is how I fixed the sensor issue.
Disclaimer: IF YOU ARE UNSURE OF MY INSTRUCTIONS USE A MULTIMETER OR TESTER TO ENSURE YOU AREN'T MODIFYING THE WRONG WIRES WHICH COULD RESULT IN ELECTROCUTION IF DONE IMPROPERLY.
Over time the basket tends to sag, which prevents the little sensor from contacting it for the unit to realize the door is shut. The sensor is a spring loaded piece of plastic hanging from the underside of the coffee maker which makes contact with the basket when it closes. If you're looking straight on it is to the left.
What you'll have to do is either find a way to fix the basket sag, force the sensor closed, or do what I did and modify the unit.
Sensor modification:
You will need a size 10 security bit with the hollow center (not just a plain star bit) screwdriver to take the four screws out of the bottom to reveal the wires you need to modify. There are two blue wires that go to the top of the unit which are crimped onto two black wires. The two black wires lead to the circuit board which is extremely difficult to get to on this model. All you have to do is snip those two black wires and install a push button which keeps the circuit closed until you push it. Initially I thought twisting them together would work but this unit will not brew coffee a second time unless you remove the basket and toggle the sensor input. So I basically have to unplug the unit and plug it back in to reset that. I will be adding the push button soon.
Ensure you buy the right push button. You need one that keeps the circuit closed until you push it, most push buttons keep the circuit open until you press them. Alternative is to buy a metal toggle switch, preferably one that spring loads back to the center after you push it.
To summarize:
1) Fix basket sag or wedge sensor to closed position.
OR
1) Remove bottom plate of coffee maker
2) Snip the blue wires leading to the sensor and add a push button or toggle switch on the two black wires they were connected to. Mount switch externally so you can push it to fool the unit to think you removed and replaced the basket.
My attached picture shows my temporary twisted wire solution with yellow connector before I added the push button. Note that while I'm holding the blue ones leading to the sensor, the two small black wires are what's important. I did this modification before making an account here.
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