Microwave will not start; display shows E11 shortly after pressing START.

Safety first: Unplug the microwave from the wall outlet. If built-in, switch off the dedicated circuit breaker. Microwaves contain high-voltage capacitors that can retain a charge; do not access internal high-voltage areas unless you are trained.

Step-by-step checks (user level):

• Inspect the door: Open and close the door firmly several times. Ensure it closes evenly and the latch hooks fully engage. Look for cracks or deformation in the plastic latch.
• Check for obstructions: Make sure no food debris, foil, or warped rack is preventing the door from closing fully.
• Test door operation: With the door closed, gently lift up and push down on the door. If the display flickers or the error appears only when the door is moved, the door switches or latch are likely faulty.

Technical inspection (recommended for a technician):

• Remove the outer cabinet (after unplugging) to access the door interlock switch assembly on the right side of the cavity.
• Use a multimeter to test continuity of the primary and secondary door switches (Electrolux part numbers vary by model, often listed as "Interlock Switch" or "Monitor Switch"). Replace any switch that does not change state (open/closed) correctly when the door is operated.
• Inspect the door latch hook assembly for wear or cracks; replace if the hooks are rounded or loose.
• Verify the switch mounting bracket is not bent; realign or replace if necessary so that the door actuates all switches fully.

If you are not comfortable working around high-voltage appliances, contact an authorized Electrolux service technician.