Can a defective garbage disposal cause a sink to not drain? Appliance Repair Troubleshooting Questions › Category: Garbage Disposals › Can a defective garbage disposal cause a sink to not drain? 0 Vote Up Vote Down Anonymous asked 7 years ago I have checked the trap and all pipes connected to disposal, no blockage. Also have snaked the pipe (behind wall) that acts as drain. Email Name Website Comment Current ye@r * Leave this field empty Your Answer Your Email Your Name Accepted file types: txt, jpg, pdf Add another file