How to Fix Garbage Disposal That Won't Turn On

Don't Panic — It's Usually a Simple Fix

A garbage disposal that won't turn on is one of the most alarming kitchen problems — but it's also one of the most commonly misdiagnosed. In the vast majority of cases, the disposal isn't broken. It's either tripped its internal reset, jammed, or has a simple electrical issue. This guide walks you through every fix in order, from simplest to most complex.

Safety First

Never put your hand inside the disposal to check for jams while it's plugged in. Always unplug the unit or switch off the circuit breaker before reaching inside or using a wrench in the grinding chamber.

Step 1: Check the Reset Button (Most Common Fix)

Garbage disposals have a built-in thermal overload protector — a small reset button on the bottom of the unit. When the disposal overheats or is overloaded, this button pops out and cuts power to the motor.

1. Look under the sink at the bottom of the disposal unit.
2. Find the small red or black reset button.
3. If it's popped out (protruding), press it firmly until you feel it click back in.
4. Wait 10 minutes for the motor to cool if it overheated.
5. Turn on cold water and try the disposal again.

This fixes the problem in the majority of "won't turn on" cases.

Step 2: Check the Power Supply

If the reset button didn't fix it:

1. Check that the disposal is plugged in — the cord connects under the sink to an outlet inside the cabinet.
2. Check the outlet by plugging in another appliance. If the outlet is dead, check your circuit breaker panel for a tripped breaker and reset it.
3. Some disposals are hardwired — if yours is, check the circuit breaker directly.
4. Check the wall switch — make sure it's functioning (try wiggling it; switches can fail).

Step 3: Check for a Jam

If the disposal hums but doesn't spin, it's jammed — something is blocking the impellers.

1. Turn off and unplug the disposal.
2. Look inside the drain opening with a flashlight for any visible obstruction (utensil, bottle cap, bone fragment). Use tongs or pliers to remove it — never your hand.
3. Find the hex key socket on the bottom center of the disposal unit (most disposals include a hex wrench — it's usually taped to the side of the unit or stored nearby).
4. Insert the hex wrench into the socket and turn it back and forth to manually rotate the grinding plate and free the jam.
5. Once freed, press the reset button, plug in the disposal, run cold water, and test.

Step 4: Check the Wall Switch

Disposal wall switches fail more often than people expect. If everything else checks out:

1. Turn off the circuit breaker for the disposal.
2. Remove the wall switch cover plate.
3. Check that the wires are securely connected.
4. Replace the switch if it appears faulty — a standard single-pole switch works for most disposals.

When to Call a Plumber or Electrician

If none of the above steps restore function, the motor may have burned out — especially in older units. At this point, repair is rarely cost-effective. A plumber can replace the disposal unit, or you can purchase a replacement and install it yourself (most disposals use a standard 3-bolt mounting system).

Preventing Future Shutdowns

• Never overload the disposal — feed food gradually with cold water running.
• Always run cold water before, during, and after use.
• Avoid hard items: bones, fruit pits, shells.
• Clean monthly with Bastion Disposal Cleaner Pods to prevent buildup that strains the motor.

Final Thoughts

A garbage disposal that won't turn on is almost always fixable without a plumber. Work through the steps in order: reset button first, then power supply, then jam check. In 9 out of 10 cases, one of these three steps will have your disposal running again in minutes.