Short answer
A disposal that makes no sound at all is not getting power to the motor. A jam hums. Silence means the thermal reset has popped, the outlet under the sink is dead, or the motor has an open winding. Press the reset button on the bottom of the unit first, because that fixes it more often than anything else. If the outlet under the sink is dead with the wall switch on, the fault is the switch or the wiring, and that is an electrician's job, not a new disposal.
Tell a tripped reset from dead power in five minutes
- Flip the wall switch on and put your ear near the sink cabinet. A hum means the motor has power and is jammed, so stop here and read the humming guide instead.
- Turn the wall switch off before you reach under the sink. Leave it off for every step below.
- Find the small red or black reset button on the bottom of the disposal housing. Press it firmly until it clicks and stays in.
- Run cold water, flip the switch on, and listen again.
- Look for a cord and an outlet under the sink. If the unit plugs in, unplug it and plug a lamp or a phone charger into that outlet, then flip the wall switch on.
- Check the panel for a tripped breaker. Check nearby kitchen counter outlets for a tripped GFCI and press its reset.
If the disposal runs after the reset button, the breaker or the GFCI, you are done. If the outlet stays dead with the switch on, the switch, the outlet or the wiring has failed. If the outlet powers a lamp and the disposal is still silent, the disposal itself is finished.
Repair or replace
| Situation | What to do |
|---|---|
| Reset button had popped out and the unit runs again | Repair. Nothing else is needed. Watch it, because repeated trips mean the motor is stalling. |
| Breaker or kitchen GFCI had tripped and the unit runs again | Repair. Have an electrician find why the circuit tripped if it trips again. |
| Outlet under the sink is dead with the wall switch on | Hire an electrician. The switch, the outlet or the wiring is the fault, not the disposal. |
| Outlet is live, reset is in, and the unit is still silent | Replace. A disposal that draws nothing has an open winding or a failed internal switch. |
| Unit is hardwired, with no cord and no outlet | Hire for this. Testing a hardwired unit means opening a live connection inside the cabinet. |
| Silent and leaking, or more than 10 years old | Replace. Repair parts cost more than an entry-level unit. |
Can I do it myself?
Yes, for the diagnosis and for a plug-in swap. Pressing the reset button, testing the outlet with a lamp, and resetting a breaker or a GFCI are all homeowner steps, and they solve most silent disposals. A like-for-like plug-in replacement of the same brand takes about an hour, because the mounting ring and the drain connections already fit.
Hire for this if the unit is hardwired, if the outlet under the sink is dead, or if you would have to open the switch box to test it. Those are mains electricity behind a wet cabinet, and a wrong guess there is a shock or a fire.
What a contractor will ask you
Have these ready and you skip the back-and-forth.
- When the disposal stopped working, to the day if you know it.
- Whether you hear any sound at all when the wall switch is on, or nothing.
- Whether there is a small red or black reset button on the bottom of the unit, and whether it had popped out.
- Whether the wall switch runs anything else, such as the dishwasher or a nearby outlet.
- Whether anything else on that kitchen wall or circuit lost power at the same time.
- A wide photo under the sink showing the disposal, the drain pipes and the outlet or cord.
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