Microwave will not start; display shows E01 immediately after pressing Start.

Safety first: Unplug the microwave from the wall outlet before any disassembly. Microwaves contain a high-voltage capacitor that can retain a dangerous charge even when unplugged. Do not touch internal high‑voltage components (capacitor, transformer, magnetron). If you are not experienced, contact a qualified technician.

Step-by-step checks:

• 1. Inspect the door and latch: Check that the Blomberg microwave door closes fully and evenly. Look for cracked or bent latch hooks and damaged door hinges. If the door sags or does not click firmly, the interlock switches may not engage.
• 2. Check for obstructions: Make sure no food debris or warped door seals are preventing full closure. Clean the door frame and latch area with a damp cloth.
• 3. Test door operation: With the unit plugged in (no disassembly), open and close the door several times and listen for distinct clicks from the interlock switches. If the E01 error appears intermittently when gently pressing or lifting the door, the switches or latch are likely worn.
• 4. Internal switch inspection (advanced): Unplug the unit. Remove the outer cabinet (usually screws at the back and sides). Locate the door interlock switch cluster near the latch hooks. Visually inspect for burned terminals, loose spade connectors, or broken switch actuators.
• 5. Electrical testing: Using a multimeter set to continuity, test each door switch (primary, secondary, monitor) according to its NO/NC configuration. Replace any switch that does not change state reliably when the door is opened/closed.
• 6. Reassemble and test: Refit the cabinet, tighten all screws, plug in, and test operation. If E01 persists, the control board may not be reading the interlock circuit correctly and professional service is recommended.