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How to test a GFCI outlet

The U.S. Consumer Product Safety Commission says to test every GFCI once a month, following the manufacturer's instructions. If you do not have them, plug a light into the outlet and turn it on, press the test button (the light should go out), then press the reset button (the light should come back on). If either step fails, CPSC says to replace the GFCI.

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How to test a GFCI outlet

Checklist

  • Plug a light into the GFCI outlet and turn it onMonthly
  • Press TEST: the light should go outMonthly
  • Press RESET: the light should come back onMonthly
  • Replace any GFCI that fails either stepAs needed
  • Check every GFCI: kitchen, bathrooms, garage, unfinished basement, laundry and utility sinksMonthly

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The three-step test

CPSC's home electrical checklist gives this procedure for when you do not have the manufacturer's instructions: plug a light into the outlet and turn it on; press the test button and see whether the light goes out; press the reset button and see whether it comes back on.

When to replace it

CPSC says that if the light does not go out when you press test, or does not come back on when you press reset, replace the GFCI.

Which outlets to check

The CPSC checklist asks whether you have GFCI outlets in your kitchen, bathrooms, garage, unfinished basement and around laundry, utility and wet bar sinks. Test each one it applies to, once a month.

Questions

How often should I test a GFCI outlet?

Once a month, according to the CPSC home electrical safety checklist.

What if the light stays on when I press TEST?

CPSC says to replace the GFCI.

What if the light does not come back after RESET?

CPSC says to replace the GFCI.

Sources

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General guidance for typical homes. Follow your equipment manufacturer's instructions and local codes, and hire a pro for anything you're not comfortable doing.