NC means “Not Communicating”. Rest assured, your modules are still producing power, but the micro-inverter has lost its connection to your ECU (Energy Communication Unit). This does happen from time to time, and will often correct itself after 24-48 hours.
If the issue persists for longer than 48 hours, please email us at serviceyyc@livezeno.com for Calgary and serviceyeg@livezeno.com for Edmonton so we can investigate the issues further.