Microwave beeps and will not start; display shows E1 immediately after pressing Start.

Safety Warning: Microwaves contain high-voltage components and a high-voltage capacitor that can retain a dangerous charge even when unplugged. If you are not experienced with microwave repair, contact a qualified technician. Always unplug the microwave and wait several minutes before removing any covers.

Step-by-step checks (external and basic):

• 1. Power reset: Unplug the Tower microwave for 5–10 minutes, then plug it back in and try again. Sometimes E1 can be triggered by a control glitch.
• 2. Check door closure: Open and firmly close the door. Ensure nothing is obstructing the door (food debris, warped container, foil, etc.). The door should close evenly and latch with a positive click.
• 3. Inspect door latch hooks: With the door open, visually inspect the plastic latch hooks on the door. If they are cracked, bent, or loose, the interlock switches may not be actuated correctly.
• 4. Gentle door pressure test: With the unit plugged in, close the door and press Start. While it attempts to start, gently lift and push on the door. If the error changes or the unit briefly starts, the door switches or latch alignment are suspect.

Internal checks (for trained persons only):

• Remove the outer cabinet (after unplugging) and locate the door interlock switch assembly on the latch side.
• Using a multimeter, test the primary door switch and monitor switch for proper continuity when the door is opened and closed.
• Replace any switch that shows open when it should be closed (or vice versa), or that feels loose or sticky when actuated.
• Inspect the door switch mounting bracket for cracks or distortion; replace if it allows the switches to move.

When to stop: If you are unsure how to safely discharge the high-voltage capacitor or identify the switches, do not proceed further. Contact a professional appliance technician familiar with Tower microwaves.