Garbage Disposal Not Working? A Tucson Plumber's Troubleshooting Guide

A garbage disposal that hums, clicks, or does nothing at all is usually fixable in a few minutes. Work through these steps in order before calling anyone — including us.

Safety first

Never put your hand into a disposal. Before doing anything below, switch the disposal off at the wall and unplug it under the sink, or shut off its breaker.

Step 1: It does nothing — no sound at all

This is almost always electrical.

• Press the red reset button on the bottom of the unit. If it has tripped, it will click in.
• Check the breaker panel for a tripped breaker.
• Confirm the unit is plugged in — under-sink plugs get bumped loose during storage or repairs.
• If it is on a switched outlet, test the switch.

Step 2: It hums but will not spin

The motor has power but the impeller plate is jammed.

1. Turn off power at the wall switch and unplug the unit.

2. Insert the hex wrench that came with the disposal into the socket in the center of the underside. Any 1/4" Allen key works.

3. Rotate back and forth until it turns freely through a full circle.

4. Remove any debris from the chamber with tongs or pliers — never your fingers.

5. Restore power, press the reset button, run cold water, and test.

Common jam culprits: fruit pits, bones, silverware, twist ties, bottle caps, and fibrous vegetable strands.

Step 3: It runs but drains slowly or backs up

The disposal is fine — the drain line is clogged.

• Check and clean the P-trap under the sink.
• If a dishwasher is connected, confirm the drain hose is clear and has a high loop.
• If the other side of a double sink also backs up, the blockage is farther down the branch line and needs professional drain cleaning.

Step 4: It leaks

• Top of the unit: the sink flange seal has failed and needs new plumber's putty and re-tightening.
• Side inlet: the dishwasher hose clamp is loose.
• Bottom of the unit: an internal seal has failed. That means replacement, not repair.

Step 5: Loud grinding or metal-on-metal noise

Stop immediately, cut power, and look for a foreign object. If the chamber is clear and it still grinds, internal components are damaged and the unit should be replaced.

When to replace instead of repair

• Water leaking from the motor housing
• Frequent resets even with normal use
• Unit over about 10 years old
• Persistent odor that returns after cleaning, indicating corroded internals

Habits that make disposals last

• Always run cold water before, during, and 20 seconds after use
• Feed waste gradually rather than filling the chamber
• Never grind grease, bones, coffee grounds, eggshells, pasta, rice, or fibrous peels
• Grind ice cubes monthly to knock debris off the impellers
• Deodorize with citrus peel and a little baking soda

Tucson's hard water accelerates scale in the disposal and the drain line below it, which is why kitchen lines here clog faster than most. A water softener helps more than people expect.

Related reading

• 7 Warning Signs You Need Professional Drain Cleaning in Tucson
• Hydro Jetting vs. Drain Snaking
• Hard Water in Tucson: Why It's Wrecking Your Plumbing

Still stuck?

If the reset and wrench trick did not do it, we will. Priority Rooter & Plumbing repairs and replaces disposals across Tucson, Catalina Foothills, and Rita Ranch. Call 520-338-9496 or schedule service online.