Garbage disposal causes lights to flicker or dim significantly when starting.

Safety first: Electrical work should be carried out by a qualified electrician.

• Check circuit design: Ideally, the disposal should be on a dedicated or appropriately rated circuit, not shared with lighting. Have an electrician review the installation.
• Inspect connections: With power off, check the junction box and fused spur for loose terminals, especially the neutral. Tighten as needed.
• Capacitor check: A failing start capacitor can cause the motor to draw high current for longer. Inspect and replace if bulging or leaking.
• Upgrade wiring if needed: If the cable size is inadequate for the disposal's rated current, have it upgraded to the correct cross-section.