What causes a light switch to stop working but light stays on?

A light that stays on when the switch does nothing usually means the switch failed closed or the circuit is bypassing the switch. Common causes: failed switch contacts, line and load tied together, neutral switched instead of hot, a miswired 3‑way, loose backstabbed connections, or a failed/programmed smart switch. Turn off the breaker before any checks. Our electricians troubleshoot outlets, wiring, and panels across Los Angeles, including Chatsworth.

Updated: 2025-11-05 00:00:00

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