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title: What do the different EMP light colors indicate
description: Represent, LED, traffic light
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# What do the different EMP light colors indicate

Green: The system is functioning normally.  
Yellow: It could mean:  
1\. Some microinverter communication has been interrupted since the beginning of day or…  
2\. Some microinverters have not been properly registered or…  
3\. Some microinverters have low power production (abnormal behavior or weak/lack of sunlight)  
Consider checking the details of the site in the EMP and verifying microinverter UID registration.  
Red: ECU disconnected from internet.  
Black/Gray: The system has never reported production data. This system could be offline. If it should be online, verify that the ECU has been installed properly and connected to the internet.

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