CSLB C-36 Plumbing ContractorService, Repair, and MaintenanceMedium
A client reports that their garbage disposal is completely unresponsive – no hum, no grind, no sound at all – when the switch is flipped. What is the most probable initial troubleshooting step a plumber should take?
- AInspect the wiring connections within the disposal unit.
- BCheck the circuit breaker for the disposal.
- CUse an Allen wrench to clear the impellers.
- DAttempt to reset the disposal using the button on the bottom.
Show answer & explanationAnswer & explanation
Correct answer: B. Check the circuit breaker for the disposal.
If a garbage disposal is completely unresponsive (no hum, no sound), the first step is always to check the power supply by verifying the circuit breaker. A tripped breaker means no power reaches the unit.
Why the other options are wrong
- A. Inspecting internal wiring should only be done after verifying external power supply and is a more advanced step.
- C. An Allen wrench is used to clear a jammed motor (when it hums but doesn't grind), not for a unit with no power.
- D. The reset button is for thermal overload, which typically occurs after a hum or grind, not for a completely unresponsive unit.
Garbage Disposal No Power Troubleshooting
Steps to diagnose and resolve a garbage disposal that is completely unresponsive with no sound or hum.
- No power = no sound, no hum
- First check: circuit breaker
- Second check: GFI outlet
- Third check: internal wiring/motor
Memory trick: Silent disposal? Breaker first, then the reset curse!