the clock on my mr coffee bvmc-zh1b keeps resetting to 12:00 every time i unplug it, is the battery dead?

Diagnosis

The Mr. Coffee BVMC-ZH1B is designed with a volatile memory system, meaning it relies entirely on a constant stream of AC power to maintain its internal clock and programmable settings. Unlike a digital alarm clock or a computer motherboard, this specific model does not contain a CMOS battery or a capacitor-based backup power supply. When the plug is pulled from the wall outlet, the electrical circuit is broken, and the internal microprocessor loses its memory state immediately. This is why the display defaults to a flashing "12:00" upon reconnection. This is not a sign of a dead battery or a hardware failure; it is the standard operational behavior for this budget-friendly circuit design. If you are experiencing this reset even while the machine is plugged in, you are likely dealing with a loose power cord or a faulty outlet, but in the case of unplugging the unit, the reset is inevitable.

How to Fix It

Since there is no battery to replace, the only solution is to manually re-sync the clock after every power interruption. Follow these exact steps to ensure the clock locks in correctly:

1. Ensure the unit is plugged into a grounded 120V AC outlet. The display will be flashing "12:00" to indicate it is in setup mode.
2. Press the HOUR button repeatedly. Do not hold the button down if you are crossing multiple hours, as the increment speed can vary. Ensure you select the correct AM or PM designation (the indicator light will be illuminated for PM).
3. Press the MIN button to advance the minutes to the current time.
4. Once the time is accurate, press the HOUR button one final time to "set" the clock. The display will stop flashing, confirming that the time has been locked into the current session's memory.
5. If you are setting a delayed brew, press the PROG button, set the desired time using the Hour/Min buttons, and then press PROG again to confirm before finally hitting the AUTO button to arm the timer.

If That Didn't Work

• Check for "Ghost" Power Cuts: If the clock resets without you unplugging it, check if the machine is plugged into a GFCI outlet (the ones with the "Reset" and "Test" buttons). If the outlet is tripping due to moisture or a surge, the clock will reset. Try a different circuit in your kitchen to rule out voltage drops.
• Inspect the Power Cord Seating: Ensure the cord is pushed firmly into the base of the machine. If the cord is frayed or the connection is loose, vibrations from the brewing process can cause a momentary break in power, triggering a 12:00 reset.
• Test for Button Stickiness: If the clock won't accept input or skips numbers, coffee residue may have leaked into the control panel. Use a damp cloth with a small amount of isopropyl alcohol to clean around the edges of the Hour and Min buttons to ensure they are depressing and releasing fully.
• Verify Outlet Stability: If you are using a power strip or surge protector, bypass it and plug the BVMC-ZH1B directly into the wall. Low-quality surge protectors can occasionally "brown out" the small amount of current needed to keep the clock running.

Heads Up

• Avoid using extension cords with high-wattage appliances like coffee makers; they can cause voltage fluctuations that may trigger unexpected clock resets.
• To prevent the need for constant resetting, avoid unplugging the machine between uses. The standby power draw for the clock is negligible and will not significantly impact your electric bill.
• Always descale your machine every 60-90 days using a white vinegar solution to prevent mineral buildup from affecting the internal heating elements, which can sometimes cause the circuit breaker to trip.
• If the display remains blank even when plugged in, check your home's circuit breaker before assuming the machine's internal fuse has blown.