Troubleshooting

Second output or zone stays dark

4 checks, sorted by how often they are the cause. For all WLED controllers with ESP32.

Check in this order: the most common and simplest cause comes first. Usually the cause is found after two or three steps.

Most common cause

Second output added? Config → LED Preferences: each output needs its own entry with its own GPIO, start LED and length. Add another output with +.

Guided check, step by step

Check 1 of 4

Second output added?

Config → LED Preferences: each output needs its own entry with its own GPIO, start LED and length. Add another output with +.

Check 2 of 4

Right GPIO?

The pins are in the controller’s datasheet, e.g. 4321-WL4: data GPIO 4, 16, 18, 19. A swapped pin leaves the zone dark.

Check 3 of 4

Start LED overlapping?

Output 2 starts where output 1 ends (start = length of output 1). Overlaps lead to duplicated or missing pixels.

Check 4 of 4

Segment switched on?

In the segments area of the UI, check that a segment exists for the second zone and is switched on.

Safety

Disconnect the PSU from mains before working on cables. Work on the 230 V side only by a qualified electrician.

Further help

LED-Emotion: “LED Preferences” menu (German) ↗

Every setting in WLED’s LED menu step by step.

Controller comparison →

Outputs, relays, microphone, LAN and datasheets of all controllers.

For business

Not solved? LED-Emotion’s WLED support (typically 30 minutes via remote or phone) usually finds the cause right away: request support · +49 5132 8305530.