Washer-dryer will not start; door symbol flashes and cycle will not begin

Safety first: Unplug the appliance and close the water tap before any work. Do not bypass the door lock for testing while the machine is powered.

Step-by-step checks:

• 1. Inspect the door and latch:
  • Open and close the door firmly; ensure no laundry is trapped in the seal.
  • Check the metal/plastic latch hook on the door for cracks, bending, or looseness.
  • If the hook is damaged, replace the door latch hook assembly.
• 2. Check the door lock (interlock):
  • Remove the front retaining band of the door seal and gently pull the seal back near the lock.
  • Access the door lock (usually held by 2 screws from the front panel).
  • Disconnect the connector and inspect for burnt pins or corrosion.
  • With a multimeter (appliance unplugged), test the lock coil for continuity according to Siemens specs (typically a few kΩ). If open or shorted, replace the door lock.
• 3. Inspect wiring harness:
  • Trace the harness from the door lock to the main control (power module).
  • Look for pinched, broken, or burnt wires, especially near the hinge area and front frame.
  • Repair or replace damaged wiring and ensure connectors are fully seated.
• 4. Control module check (advanced):
  • If the lock and wiring test good but E01 persists, the door lock relay or triac on the power module may be faulty.
  • This requires board-level diagnosis; in most cases, replace the power module.

When to call a technician: If you are not comfortable removing the front seal or testing live circuits, or if the control module is suspected, contact an authorized Siemens service technician.