the clock on my kitchenaid range keeps resetting to 12:00 every time i turn it off, it won't keep time.

Diagnosis

This issue is typically caused by a failure in the continuous power supply to the Electronic Control Board (ECB). While the oven heating elements and burners are high-voltage loads that only draw power when active, the clock and timer circuit require a constant, low-amperage feed. If the range is losing its "memory" and resetting to 12:00, it indicates that the voltage to the control board is being interrupted, even if the range seems to be functioning normally otherwise. The most common root cause on the KFEG500ESS is a loose connection at the main power terminal block or a failing capacitor on the control board that can no longer hold a charge during momentary voltage dips. In some cases, this is caused by "arcing" at the terminal screws, where carbon buildup creates a high-resistance connection that intermittently breaks the circuit. You can confirm this by observing if the clock resets specifically after a high-draw appliance (like a microwave or dishwasher) on the same circuit kicks on, which suggests a voltage drop that the range's internal power supply cannot bridge.

How to Fix It

To resolve this, you must ensure a rock-solid electrical connection from the wall outlet to the control board. Follow these steps precisely:

1. Isolate Power: Turn off the circuit breaker at the main electrical panel. Do not simply unplug the unit; ensure the breaker is flipped to the "OFF" position to prevent accidental shocks.
2. Access the Terminal: Remove the rear access panel by unscrewing the four 1/4-inch hex head screws securing the metal plate.
3. Inspect the Terminal Block: Locate the three-wire connection point (Black/Hot, White/Neutral, and Green or Copper/Ground). Look for any signs of discoloration, melted plastic, or blackened wire insulation, which indicates overheating.
4. Tighten Connections: Using a properly sized screwdriver, tighten the terminal screws. Do not over-torque, but ensure they are snug. If you find a loose wire, remove the screw entirely, trim any charred ends of the wire, strip back 1/2 inch of fresh insulation, and re-seat the wire firmly under the terminal screw.
5. Verify the Wiring Harness: Trace the wiring harness from the terminal block to the main control board. Check for any pinched wires or loose molex connectors. Unplug and re-seat the main power connector on the back of the control board to ensure a tight fit.
6. Test: Restore power at the breaker, set the clock, and power cycle the range to verify the time is retained.

If That Didn't Work

• Replace the Electronic Control Board (ECB): If the connections are tight but the clock still resets, the internal capacitors on the control board have likely failed. This prevents the board from maintaining its logic state during minor power fluctuations. You will need to replace the main PCB (Part #WPW10151128 or equivalent for your specific series).
• Check for an Unstable Circuit: If the range is on a shared circuit or an aging 40-amp breaker, you may be experiencing "brownouts" that are too brief to shut off the range but long enough to reset the digital clock. Test the outlet with a multimeter to ensure a steady 240V (and 120V for the clock) without significant fluctuations.
• Inspect the Thermal Fuse: Check the oven's thermal fuse. While a blown fuse usually kills power to the entire oven, a partially failing or pitted fuse can sometimes cause erratic power delivery to the control board. Use a multimeter to check for continuity across the fuse.

Heads Up

• Safety Warning: Always use a non-contact voltage tester before touching any wires inside the terminal block, even if the breaker is off, to ensure no residual current is present.
• Avoid Over-tightening: When tightening terminal screws, avoid stripping the threads. If a screw feels "mushy," the terminal block may be heat-damaged and require full replacement.
• Clean the Area: While the rear panel is off, use a vacuum or compressed air to remove dust and grease buildup around the control board; overheating due to poor airflow can lead to premature capacitor failure.
• Voltage Check: Ensure your home's voltage is within the 208V-240V range. Undervoltage is a leading cause of "ghost" resets in digital range clocks.