The basic rule
A garbage disposal is a sealed appliance. The parts around it, the sink flange, the mounting ring, the drain elbow, the dishwasher hose and the electrical connection, can all be fixed or swapped. The parts inside it, the motor, bearings, seals and grinding chamber, generally cannot be repaired economically.
So the first question is where the problem is. If it is outside the housing, repair is usually the answer. If it is inside, replacement usually is. Age, how often the unit has needed attention, and whether you want features it lacks all shift the decision at the margins.
Problem by problem
| Problem | Usually | Why |
|---|---|---|
| Jam that clears with a hex key | Repair | No parts needed if the motor is fine |
| Leak at the sink flange | Repair | Reseal and retighten the mount |
| Leak at the dishwasher hose or drain elbow | Repair | Clamp, hose or gasket replacement |
| Leak from the bottom of the housing | Replace | Internal seals or chamber have failed |
| Motor dead after reset and power checks | Replace | Motors are not normally repaired |
| Loud grinding from worn bearings | Replace | Bearings are inside the sealed unit |
| Failed wall or air switch | Repair | The switch is separate from the disposal |
Weighing the two
Lean toward repair when
- The unit is fairly new and runs well
- The fault is at a connection or the switch
- You are happy with its noise and power
- Only one problem has come up
Lean toward replace when
- The problem is inside the housing
- The unit is old and has needed repeated fixes
- It is noisy, weak or jams often
- The plumber is removing it anyway for a flange repair
What drives the cost of each
- Repair
- Diagnosis time, parts like gaskets or hoses, and access under the sink
- Replacement
- The unit you choose, a new flange, reconnections and haul-away
- Either
- Crowded cabinets, corroded fittings and drain problems found along the way
- Electrical
- Any outlet, switch or wiring changes, which may need a permit
Questions to ask before you decide
- Where exactly is the problem: inside the unit or at a connection?
- What would repair involve, and what would replacement involve?
- If I repair now, what is likely to fail next on a unit this age?
- Can I supply my own replacement unit?
- Are both options priced in writing?
Common questions
How long do garbage disposals last?
It varies a lot with use, the unit and what goes into it. Rather than relying on a number, look at how the unit performs and whether problems are inside the housing.
Is it worth repairing a cheap disposal?
For a connection leak or a jam, yes. For an internal failure, replacement is usually the better value.
Can I upgrade to a quieter or stronger unit when I replace?
Usually, as long as it fits the space under the sink. See the guide to choosing a new disposal.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.