Garbage Disposal Won't Turn On (No Hum, No Sound): What to Check First

First, be safe

Never put your hand inside the disposal, even when it's off. If you need to look in, use a flashlight. For anything under the sink beyond pressing a button, unplug the disposal or turn off its breaker first. If you smell burning or see scorched wiring, stop and call someone.

1. Press the reset button

Almost every disposal has a small red or black button on the bottom of the unit, facing the cabinet floor. When the motor overheats or strains on a jam, this thermal overload pops out and cuts the power. That's the single most common reason a disposal goes completely silent.

Wait 10–15 minutes for the motor to cool, then press the button firmly until it clicks and stays in. Run cold water and try the switch. If it works, great — but if it trips again quickly, something is jammed or the motor is wearing out.

2. Check the breaker

Go to your electrical panel and look for a breaker labeled disposal, kitchen, or dishwasher. A tripped breaker sits in the middle position or looks slightly off from the others. Push it fully to OFF, then back to ON.

In a lot of older LA homes and apartments — 1920s courtyard buildings in Hollywood, post-war bungalows in the Valley — the disposal shares a circuit with the dishwasher, microwave, or refrigerator. If the breaker trips every time two of those run together, the circuit is overloaded, not necessarily the disposal. That's a job for an electrician.

3. Check the GFCI outlets

If your disposal plugs into an outlet under the sink, that outlet may be protected by a GFCI — sometimes the one under the sink, sometimes a GFCI outlet on the countertop several feet away. When a GFCI trips, everything downstream loses power with no warning.

Look for outlets with TEST and RESET buttons near the kitchen, including behind the coffee maker. Press RESET firmly. Many people never realize their disposal is wired through a countertop GFCI until this happens.

4. Test the wall switch

Wall switches under the sink area get splashed and wear out. If you hear nothing at all and the reset and breaker are fine, the switch could be the problem. One quick test: if the disposal plugs into an outlet, unplug it and plug in a lamp or phone charger. If the outlet has power only when the switch is on, the switch works and the issue is the disposal. If the outlet never has power, it's the switch or wiring.

Replacing a switch is electrical work, so if you're not comfortable with it, have an electrician handle it.

5. If you have a countertop air switch

Many remodeled kitchens — we see them a lot in Beverly Hills, Los Feliz, and hillside homes — use a push button on the countertop or sink instead of a wall switch. Pressing the button sends a puff of air through a thin tube to a control box under the sink, which turns the disposal on.

When an air switch stops working, check that the tube is firmly attached on both ends and isn't kinked or cracked. Make sure the control box is plugged in, and that the disposal is plugged into the control box. The control boxes fail more often than disposals do, and replacing one is much cheaper than a new disposal.

6. Wiring and the motor itself

If you've checked all of the above and the outlet definitely has power, but the disposal stays silent, the issue is inside the unit — a burnt-out motor, a failed internal switch, or a loose wire in the electrical box on the bottom of the disposal. Hardwired disposals (no plug) have a small cover plate on the bottom where the house wiring connects. A loose wire nut there can cut power.

This is the point where I'd recommend calling someone. A technician can confirm with a meter whether power is reaching the disposal and whether the motor is responding.

Repair or replace?

If the problem was a reset button, breaker, GFCI, or air switch, the disposal itself is fine. If the motor is dead, replacement is usually the better choice — repairing a disposal motor costs more than a new unit.

A silent disposal that's more than 10 years old, also leaking from the bottom, or that trips the reset again right after you press it, is ready to be replaced. A newer disposal that went silent after a power outage or a jam is usually just tripped.

What it costs with us in Los Angeles

We come to you anywhere in our LA service area. Pricing is simple and upfront:

• $75 travel and diagnostic — always applies
• $99 on-site repair (for example a reset, re-mount, jam, or air switch fix)
• $249 replacement labor, with the new unit priced separately
• +$99 if extra piping is needed

Need help?

If you've tried the reset, breaker, GFCI, and switch and your disposal is still silent, call (213) 293-0752. See our garbage disposal repair in Los Angeles page for how a visit works, or our garbage disposal replacement page if it's time for a new unit.