Washer-dryer combo has power but will not start any cycle; Start button beeps or flashes but nothing happens.

Safety first: For checks beyond basic settings, unplug the unit before accessing internal components.

Step-by-step checks:

• 1. Verify door closure: Open and firmly close the door. Listen for the click of the latch engaging. Ensure no clothing is trapped in the gasket.
• 2. Check for control lock: Look for a control lock or child lock icon on the display. Disable it by holding the designated button combination (refer to user manual).
• 3. Try a different cycle: Select a simple cycle (e.g., rinse & spin) and press Start. If it still will not start, proceed to hardware checks.
• 4. Test door lock: With power off, access the door lock assembly and test the door-closed switch for continuity when the latch is inserted. Replace the OEM Monogram door lock if the switch is faulty.
• 5. Inspect start button and UI: If the door lock is good, the start button or user interface board may be defective. Enter diagnostic mode (if available) to test button inputs. Replace the user interface board if necessary.

When to call a technician: If software settings and door lock are correct but the unit still will not start, professional diagnosis of the control system is recommended.