The first thing to do is unplug the yello/white/black connector from the module.
If the problem goes away, then we know that the module is being told what to do.
If the problem persists, then it must lie within the module itself or power going to the module.
If the problem goes away, plug back in the connector and unplug the rest of the modules.
If the problem goes away, then one of the other modules is causing the problem.
Connect them one by one until you find the one causing the problem.
If the problem persisted, unplug the connector on the LMP controller.
Note: that you might need to just remove the network wires from the connector and the 4L’s get their power from that connector.
If the problem goes away, then there is something coming in from the network else it is the controller.
Remove any devices on the network if you suspect this is the problem and test.
Note: that you need to verify that all terminations are properly set on the devices. Only the ends of the network should be terminated. See the installation instructions for more information on setting these.