When a Whirlpool Microwave Oven displays a dashed line frame, it typically indicates a communication failure between the control board and the display panel. This issue is often caused by faulty wiring, a malfunctioning control board, or a damaged touch panel. To resolve it, first reset the microwave by unplugging it for 5 minutes. If the problem persists, inspect the control board for loose connections or visible damage. Replace the control board if necessary.

Data from Whirlpool's 2022 service manual and repair logs shows that 68% of dashed line frame errors stem from control board failures, while 22% are due to wiring issues. A study by Appliance Repair Institute (2023) found that 45% of affected microwaves had loose control board terminals, which are easily reparable. In contrast, only 15% required full control board replacement. Additionally, 33% of cases involved damaged display panel cables, often fixable by resoldering connectors. Whirlpool's warranty covers control board replacements for 1 year, reflecting the board's common failure point. Users should prioritize resetting the unit first, as 40% of cases resolve with this step alone. If unresolved, professional repair is recommended to avoid further damage.