the coffee maker turns on by itself in the middle of the night, but i didn't set a program

Diagnosis

The Black+Decker CM1160B is experiencing a "phantom brew" cycle, which is almost always caused by a lingering setting in the Delay Brew memory. This occurs when the internal logic board retains a programmed start time from a previous session that wasn't fully cleared, or when a "ghost" program was accidentally entered via a stray button press. Because the CM1160B uses a simple capacitive switch system, it is prone to registering inputs if the buttons are pressed lightly or if there is residue around the bezel. Another common cause is a "power-cycle trigger." If your home experiences a brief voltage drop or a brownout during the night, the machine's internal clock may reset or glitch. In some firmware versions of this specific model, a power surge can cause the control board to default to a previously stored "Auto-On" time or trigger the heating element to engage as a safety reset mechanism, making it appear as though the machine turned itself on. You can confirm this is a programming issue if the "Delay Brew" LED is faintly illuminated or if the machine starts at the exact same time every night.

How to Fix It

To completely wipe the memory and disable the automatic start feature, follow these precise steps:

1. Unplug the unit from the wall outlet for exactly 60 seconds to drain the capacitors on the control board.
2. Plug the unit back in. If the display flashes "12:00", the memory has been successfully reset.
3. Press the Clock button once. Look closely at the Delay Brew indicator light. If it is lit, a program is active.
4. To clear the program, press the Program button and hold it for a full 5 seconds. The "Delay Brew" light must turn off completely.
5. Check the clock setting to ensure it is accurate to the current time. If the clock is off by even a few minutes, the machine may trigger at an unexpected hour.
6. Press the Hour and Minute buttons to set the correct time, then press Clock to lock it in.
7. Ensure the Delay Brew light remains off. If it flickers back on, repeat the 5-second hold on the Program button.

If That Didn't Work

• Perform a Hard Factory Reset: If the buttons are unresponsive, unplug the machine and hold down the "Program" and "Hour" buttons simultaneously for 15 seconds while the unit is unplugged. This discharges the remaining voltage in the logic board and clears the volatile memory (RAM) that stores the brew schedule.
• Inspect for Button Sticking: Coffee residue or sugar splashes can seep under the plastic bezel of the CM1160B buttons. Use a cotton swab dipped in 90% isopropyl alcohol to clean around the edges of the "Program" and "Hour" buttons. A "sticky" button can create a bridge in the circuit, tricking the machine into thinking the program button is being held down.
• Test on a Different Circuit: Plug the coffee maker into a different outlet on a separate circuit breaker. If the machine is on a circuit with a high-draw appliance (like a refrigerator or dishwasher), electrical noise/interference can trigger the control board's relay, causing the heating element to engage spontaneously.
• Check for Moisture Infiltration: If you recently cleaned the machine with a damp cloth, moisture may have entered the control panel. Leave the machine unplugged in a warm, dry area for 48 hours to allow any internal condensation on the PCB (Printed Circuit Board) to evaporate.

Heads Up

• Avoid Power Strips: Always plug the CM1160B directly into a wall outlet. Using cheap power strips or extension cords can cause voltage fluctuations that trigger the "Auto-On" glitch.
• Water Reservoir Safety: Never leave water in the reservoir overnight if you suspect the machine is turning on by itself. A "phantom brew" with an empty pot can lead to the heating element overheating or the gasket melting.
• Button Pressure: Avoid pressing the buttons with excessive force. The tactile switches on the CM1160B are delicate; pressing too hard can permanently deform the contact point, leading to intermittent "ghost" presses.
• Regular Descaling: Mineral buildup in the heating tube can cause the machine to overheat, which sometimes triggers a safety reset that mimics a power-on cycle. Descale with white vinegar every 3 months.