How to Check a Circuit Breaker | DoItYourself.com
2009-10-28 · Step 2 - Check for a Short-Circuit. Switch the breaker completely to the OFF position, then move it back to the ON position. If it doesn't stay on or there is a humming sound when you switch it on, pull the wire out of the circuit breaker and repeat. If this is the case, there is likely a problem with the wiring. Step 3 - Testing the Panel