ETC fos/4 Panel troubleshooting

Common fos/4 Panel errors & problems

What techs run into most, and what's usually behind it. The step-by-step fix for your exact unit is in Ask Roadie.

• "Array Comm" or "Array Failure" error on display

  Likely cause: The message means the controller lost the data link to the emitter array.

  Step-by-step fixGet the fix →

• "Color Data Fail" error on display

  Likely cause: Each fixture stores per-unit color calibration; if that table cannot be read the fixture flags Color Data Fail.

  Step-by-step fixGet the fix →

• "LED High Temp" or "Power Budgeting" error; output dimming on its own

  Likely cause: When the LED head exceeds its thermal limit the fixture protects itself by power-budgeting (reducing intensity).

  Step-by-step fixGet the fix →

• "Low Battery" error when running on battery power

  Likely cause: The fixture only monitors battery voltage and warns near its threshold; it has no onboard charger, so AC presence cannot top up the pack.

  Step-by-step fixGet the fix →

• "Multiverse Failure" / fixture not responding (or responding intermittently) to wireless control

  Likely cause: A connected DMX In cable overrides the radio, so a fixture that "won't go wireless" is usually still cabled.

  Step-by-step fixGet the fix →

• "No Bundle" error on display

  Likely cause: The Panel needs a valid firmware bundle in flash to boot normally; an interrupted update leaves it empty.

  Step-by-step fixGet the fix →

• "USB Error" — fixture cannot read the USB flash drive

  Likely cause: The reader is picky about seating and drive formatting; reseating or swapping the stick clears the read failure.

  Step-by-step fixGet the fix →

• Color does not match another fos/4 or does not match the expected color

  Likely cause: Calibration corrects for unit-to-unit LED flux and wavelength differences, but only in calibrated modes and only inside the fixture's gamut.

  Step-by-step fixGet the fix →

• Fan is running loud / faster than expected

  Likely cause: Auto lets the fixture run the fan only as needed.

  Step-by-step fixGet the fix →

• Fixture is stuck on the last look sent via DMX

  Likely cause: HLL is intentional so a momentary data dropout does not black out the rig; the tradeoff is a "stuck" look when data truly stops.

  Step-by-step fixGet the fix →

• Fixture locks up / screen goes black and fan runs full speed after a quick power cycle, or output suddenly drops to zero

  Likely cause: Restarting mid-boot scrambles the boot sequence and leaves the CPU half-booted with the fan defaulted to full.

  Step-by-step fixGet the fix →

• Fixture output is flickering

  Likely cause: Corrupted or noisy DMX makes the fixture chase bad level data, showing as flicker.

  Step-by-step fixGet the fix →

Not on the list? Describe it your way, or paste the error code off the display. Ask Roadie works the problem with you until it's fixed or you have a clear next move.

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