Fluorescent Light Troubleshooting

Common Fluorescent Lighting Problems and Solutions

  1. Fixture doesn’t light or ends glow but center doesn’t
  2. Tube blinks, flickers, or is slow to light
  3. Fixture hums
  4. Black resin seeps from fixture
  5. Desk lamp doesn’t light or lights incompletely

Fixture doesn’t light or ends glow but center doesn’t

Possible CauseProcedure
No power to fixtureReplace fuse or reset circuit breaker
Tube burned outReplace tube
Wall switch faultyCheck wall switch
Tube pins make poor contact in socketsReseat tube
Replace sockets
Starter faultyReplace starter
Ballast faultyReplace ballast
Replace fixture
Grounding connections faulty (rapid-start)Tighten grounding connections

Tube blinks, flickers, or is slow to light

Possible CauseProcedure
Tube dump or dirtyWipe tube with window cleaner and dry thoroughly
Short frequent use; tube requires time to stabilizeLeave light on for longer periods
Starter faultyReplace starter
Tube makes poor contact in socketsReseat tube
Replace sockets
Ballast faultyReplace ballast
Replace fixture
Location too coldInstall ballast rated for cold temperatures

Fixture hums

Possible CauseProcedure
Ballast vibratingRemount ballast
Ballast faultyReplace ballast
Replace fixture

Black resin seeps from fixture

Possible CauseProcedure
Ballast faultyReplace ballast
Replace fixture

Desk lamp doesn’t light or lights incompletely

Possible CauseProcedure
Tube burned outReplace tube
No power to lampPlug lamp into another outlet to test
Switch faultyReplace switch
Tube pins making poor contact in socketsReseat tube
Replace socket
Ballast faultyReplace ballast

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