Maintenance and Troubleshooting
20
Problem Observed
Possible Cause
Solution
No LEDs on a module light.
Power connector unplugged
at module.
Plug in connector.
Address and signal connector
unplugged at module.
Plug in connector.
Power plug terminals are not
properly seated, or the wire is
bad.
Inspect all wires and terminals
for power plug. Repair as
needed.
The module is bad.
Replace failed module.
One module is garbled, too
bright or too dim, erratic, etc.
Signal plug terminals are not
seated well at driver board, or
wire is bad.
Inspect all wires and terminals
for signal plug. Repair as
needed.
The module is bad.
Replace failed module.
One pixel does not turn off.
The module is bad.
Replace failed module.
One pixel does not light.
The module is bad.
Replace failed module.
One string (half the LEDs) in
one pixel does not light.
The module is bad.
Replace failed module.
Electronically controlled fans or
heaters are reported as on, but
all are off.
Circuit breaker tripped.
Reset breaker.
Relay is bad.
Replace relay.
VCB is bad.
Replace failed VCB.
Ventilation fans do not run.
Circuit breaker tripped in traffic
cabinet.
Reset the breaker.
Temperature inside the display
is lower than the thermostat
setting.
This is not a problem.
The thermostat or its wiring is
bad.
Repair as needed.
VCB is bad.
Replace failed VCB.
Ventilation fans run
continuously.
Temperature inside the display
exceeds the thermostat
setting.
This is not a problem.
The thermostat is stuck on or
the wiring is shorted.
Replace the thermostat or
repair wiring.
VCB is bad.
Replace failed VCB.
