Washer-dryer combo will not start; display shows E01 and cycle will not begin even though power is on.

Safety first: Unplug the Monogram combo unit or switch off the dedicated circuit breaker before any disassembly. Do not bypass the door lock for testing with the unit powered.

Step-by-step checks:

• 1. Inspect the door and latch: Open and close the door firmly. Check that the door is not sagging and that the latch tongue fully engages the strike. Tighten any loose hinge screws. Make sure no clothing is trapped in the door gasket.
• 2. Check the door lock bezel and strike: Look at the plastic strike on the door and the lock opening on the front panel. If the strike is cracked, bent, or loose, replace it. Ensure the lock opening is not obstructed by debris or detergent residue.
• 3. Access the door lock assembly: Remove the front panel or the door gasket retaining band (depending on model) to access the door lock assembly mounted on the front panel. Take a photo of wiring before disconnecting.
• 4. Test the door lock switch: With a multimeter set to continuity, test the lock and switch terminals according to the wiring diagram (usually located behind the top panel or control panel). The lock solenoid should show continuity; the lock and door-closed switches should change state when the latch is inserted.
• 5. Inspect wiring harness: Check the harness from the door lock to the main control board for pinched, broken, or burned wires. Reseat the connector at the control board.
• 6. Replace the door lock assembly if faulty: If the lock coil is open or the switches do not operate correctly, install a new OEM Monogram door lock assembly. Reassemble the front panel/gasket, ensuring the gasket is seated evenly.
• 7. Reset power and test: Restore power, then run a short wash cycle to confirm the E01 code is cleared and the door locks and unlocks properly.

When to call a technician: If the door lock and wiring test good but E01 persists, the main control board may be defective and should be diagnosed and replaced by a qualified Monogram technician.