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

Safety first: Unplug the Toshiba microwave from the wall outlet before any inspection. High voltage is present inside even when unplugged; do not touch the high-voltage capacitor or magnetron area.

Steps to check door switches and latch:

• 1. Inspect the door closure: Ensure the door closes fully and evenly. Check for broken or bent plastic latch hooks on the door. If the door does not click firmly, the interlock switches may not engage.
• 2. Check for obstructions: Clean the door frame and latch area. Food debris or grease can prevent the latch from fully engaging the switches.
• 3. Test door operation: Open and close the door several times while watching the display. If E01 appears only when the door is slightly moved, the switches or latch are likely worn.
• 4. Basic switch check (no disassembly): With the unit unplugged, gently press on the door around the latch side while closing. If the error intermittently clears, the switches or latch are misaligned and should be replaced.
• 5. Professional-level test (recommended for technicians): Remove the outer cabinet, locate the door interlock switch assembly on the right side of the cavity, and test each switch with a multimeter for continuity when the door is closed. Replace any switch that does not change state correctly.

When to stop: If you are not comfortable removing the cabinet or working near high-voltage components, stop after visual checks and contact a qualified Toshiba service technician to replace the door switch assembly.