Outlets, switches & breakers

One half of a duplex outlet doesn't work

Duplex outlets have a breakaway tab that lets the top and bottom work independently; if only one half works, that tab or a connection has likely failed.

Difficulty
Moderate
Time
20–40 minutes
DIY cost
$5–$15
Pro cost
$100–$180

Symptoms

  • Top or bottom plug works, the other doesn't
  • No switch in the room seems to control it
  • Both halves used to work

Likely causes

  • CommonA broken or loose internal connectionThe metal tab connecting the two halves can crack or the screw securing it can loosen.
  • CommonA failed outletInternal wear can affect just one half of the receptacle.
  • PossibleIt's actually a switched halfSee if a wall switch controls the dead half before assuming it's broken.

What to do

  1. Check nearby switches to rule out a switched-outlet setup.
  2. Test both halves with a lamp or phone charger you know works.
  3. Turn off the breaker for that outlet and confirm it's dead with a voltage tester.
  4. Remove the cover plate and check whether the small connecting tab between the two brass terminals is intact.
  5. If the tab is broken or a screw is loose, the outlet needs to be replaced rather than repaired.
  6. Install a new outlet, keeping the tab intact unless you specifically want a switched half.
  7. Restore power and test both halves again.

Tools and parts

  • Screwdriver
  • Non-contact voltage tester
Replacement duplex outletSearch: “15 amp duplex outlet”

When to call a pro

Call an electrician if you're not comfortable replacing the outlet or if wiring behind it looks damaged.

Safety

Use caution

Switch off the breaker and verify with a tester before opening the outlet.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.