Quick Answer:
If the disposer won’t run after a brief outage, first check the outlet and any nearby GFCI, then press the disposer’s reset button one time. After that, test the unit briefly. If it still won’t run or it hums, follow the step-by-step checks below before doing anything else.
Why This Happens
Short outages or surges can trigger safety features in a garbage disposal or the outlets that feed it. Common causes:
- Internal thermal overload or motor protector tripped when the motor stalled.
- A GFCI outlet or switched outlet lost power and needs to be reset.
- A jam occurred while power returned, leaving the impellers unable to turn.
- In rare cases a breaker or wiring issue occurred during the outage.
Step-by-Step What to Do
1. Give it a minute and stay safe
Wait a minute after power returns so any internal protection can cool. Keep hands out of the sink opening and avoid running water until you know the unit responds normally.
2. Check the outlet and any GFCI
Look for a GFCI outlet near the sink, under the sink, in the garage, or on a nearby wall. If a GFCI has tripped, press its reset button. Also make sure the wall switch for the disposal is in the off position before continuing.
3. Press the disposal reset button once
Locate the small red or black reset button on the bottom or side of the disposer and press it one time. This resets the internal overload. Do not press it repeatedly—press once and wait a few seconds.
4. Test briefly
- Turn the disposal on for a second or two to see if it runs. If it runs, let it clear any minor blockage with cold water for a short time, then switch it off.
- If it hums or doesn’t turn, stop testing and move to the next safe checks.
5. Check for a jam safely
- Turn the disposal switch off and, if possible, shut the circuit breaker off for extra safety.
- Use the hex wrench (often provided with the unit) in the hole at the bottom of the disposer to turn the motor shaft by hand and free a jam. If your unit doesn’t have that hole, use long-handled pliers from above to remove visible debris—never put your hand inside.
- Restore power and test briefly again.
What Not to Do
- Do not repeatedly cycle power after an outage; reset once and investigate calmly.
- Do not put your hand into the disposal or stick fingers down the drain.
- Do not try to bend or force parts with your bare hands while the unit is powered.
When to Call a Professional
Call a plumber or electrician if:
- The unit still doesn’t run after the reset and safe jam checks, or it only hums.
- You notice burning smells, smoke, or repeated tripping of the circuit—this may indicate an electrical problem.
- You see frequent issues like Disposal trips breaker repeatedly or it behaves oddly under normal use (for example, Disposal jams when cold water used).
Safety Notes
- Always turn off the disposal switch before doing physical checks. For extra safety, switch the circuit breaker off.
- Use tools (hex wrench, pliers) rather than fingers to remove jams. If unsure, stop and call a pro.
- If you suspect wiring damage or repeated electrical trips, hire a licensed electrician rather than attempting repairs yourself.
Common Homeowner Questions
- Can I press the reset button more than once? No — press it once, test, and investigate other causes if it doesn’t restart.
- Why does the disposer hum but not spin after the outage? That usually means the motor is powered but the impellers are jammed or the motor is stalled; follow the safe jam-check steps.
- Could a power surge permanently damage the disposer? It’s possible but uncommon; if it won’t run after resets and safe checks, have a professional evaluate it.