Garbage disposals are electromechanical appliances with plumbing connections at both the drain outlet and, on most models, an inlet port for dishwasher discharge. When they fail, the problem is usually mechanical, electrical, or related to the plumbing connection rather than all three at once, and identifying the actual failure point is the first step. Long Beach Pro Plumbing Inc repairs and replaces garbage disposals for homeowners throughout Long Beach.
The grinding mechanism in a disposal consists of a rotating plate called the impeller or turntable, driven by a single-phase AC induction motor, with fixed shredder ring teeth around the perimeter of the grinding chamber. The impeller does not cut food waste in the way a blade does. Instead, centrifugal force throws waste against the stationary shredder ring, which breaks it into particles small enough to pass through the outlet baffle. When a hard object like a bone or a pit lodges between the impeller and the ring, the motor overloads and the thermal protection switch trips, cutting power to the motor.
The reset button on the bottom of the unit is the thermal protection switch reset. Pressing it after allowing the motor to cool, typically five to ten minutes after the jam, and then freeing the impeller using the hex key socket on the underside of the unit will restore function in most jam situations. The hex key turns the impeller manually to dislodge whatever is jammed. If the impeller will not turn and the reset trips again immediately on restart, the motor itself may have overheated damage or there may be a more severe obstruction.
Disposal leaks require locating the source before any repair. A leak at the sink flange, the collar that mounts the disposal to the sink drain opening, typically originates from failed plumber’s putty under the flange or a loose mounting assembly. The three-point mounting ring that holds the disposal to the flange can loosen over time, allowing the flange to lift and the seal to fail. Retightening the mounting ring and replacing the putty usually resolves this.
A leak from the side of the unit at the dishwasher inlet or the drain outlet is usually a fitting or hose connection issue. The drain outlet connects to the drain tailpiece with a slip joint fitting and a rubber gasket that can deteriorate. The dishwasher inlet connection uses a hose clamp on a barbed fitting that can loosen or crack.
A leak from the bottom of the disposal housing indicates internal seal failure. The shaft seal that prevents water in the grinding chamber from reaching the motor has failed. This internal seal is not serviceable in most consumer-grade disposals, and failure of the bottom seal typically means the unit needs replacement.