Microwave will not start a cook cycle and displays E1 on the control panel.

Safety first: Unplug the microwave from the wall outlet. Microwaves contain a high-voltage capacitor that can retain a dangerous charge even when unplugged. Do not touch internal high-voltage components unless you are trained. For anything beyond basic inspection, contact a qualified technician.

Basic checks you can do safely:

• Check the door closure: Open and close the door firmly. Ensure the door is not sagging and that the latch hooks fully engage the cabinet. If the door feels loose or misaligned, the interlock switches may not actuate correctly.
• Inspect the door latch area: With the unit unplugged, visually inspect the plastic latch hooks on the door for cracks or deformation. If broken, the door latch assembly must be replaced.
• Test door operation: Plug the unit back in and gently press on the door while trying to start a short cook cycle (e.g., 10 seconds with a cup of water). If the error disappears when you lift or push the door, the door switches or latch alignment are suspect.

When to call a technician:

• If the E1 code persists after confirming the door closes properly.
• If the door latch hooks are intact but the unit still thinks the door is open.
• A technician can remove the cabinet, test the primary, secondary, and monitor door switches with a multimeter, and replace the faulty switch or adjust the latch bracket.