Washer-dryer combo will not power on at all; no lights or display, unit appears dead.

Safety first: Before opening the unit, ensure it is unplugged. If you are not comfortable working with mains voltage, contact a qualified technician.

Step-by-step checks:

• Check home power: Verify the circuit breaker is not tripped and the outlet has correct voltage using a known-good appliance or a meter.
• Inspect power cord: Look for cuts, burns, or crushed sections. Replace if damaged.
• Check line filter and wiring: Remove the top or rear panel and trace the power from the cord to the line filter and then to the main control board. Ensure all connectors are tight and there are no burnt components.
• Internal fuse: Some Whirlpool boards have an onboard fuse. If accessible and blown, investigate cause (shorted component) and replace the board or fuse per service guidance.

When to replace: If power is present at the board but there is no response from the display or controls, the main control board is likely defective and should be replaced.