Microwave clock or timer runs too fast or too slow.

Safety: No internal high-voltage work required for basic checks.

• Reset clock: Unplug the microwave for several minutes, then reset the clock and observe accuracy over a day.
• Power quality: Avoid using long extension cords or circuits with heavy loads that may cause voltage fluctuations.
• Control replacement: If timing remains inaccurate, the control PCB may need replacement.