Other Faults; Troubleshooting A Non-Functional Microinverter - enphase IQ8MC Installation And Operation Manual

Method: Clear this error using the Enphase Installer Portal
•
Log in to the Enphase Installer Portal and access the system.
•
Click the Events tab. The next screen shows a current DC Resistance Low - Power Off condition for
the system.
•
Click DC Resistance Low - Power Off.
•
Click the serial number of the affected microinverter.
•
Click Tasks and Clear GFI to clear the event.

Other faults

All other faults are reported to the gateway. Refer to the
Manual for troubleshooting procedures.

Troubleshooting a non-functional microinverter

To troubleshoot a non-functional microinverter, follow the steps in the order shown:
WARNING: Risk of electric shock. Always de-energize the AC branch circuit before servicing.
Never disconnect the DC or AC connectors under load.
WARNING: The Enphase microinverters are powered by DC power from the PV modules. Make
sure you disconnect the DC connections, reconnect the DC power, and then watch for the solid
green for about six seconds after connection to DC power.
A. Make sure AC circuit breakers and isolator switches are closed.
B. Check the connection to the grid and verify that the grid voltage is within allowable ranges.
C. Verify that AC line voltages at all PV circuit breakers at the electrical panel and sub-panels are within
the ranges shown in the following table.
D. Verify that the AC line voltage at the junction box for each AC branch circuit is within the ranges
shown in the following table.
Single-phase service
L1 to N
*Nominal voltage range can be extended beyond nominal if required by the electricity network operator.
E. Using an IQ Disconnect Tool, disconnect the AC cable for the microinverter in question from the IQ
Cable.
F. Verify that the grid is present at the microinverter by measuring line-to-line voltage and line-to-
ground voltage at the IQ Cable connector.
G. Visually check that the AC branch circuit connections (IQ Cable and AC connections) are properly
seated. Reset if necessary. Check for any damage, such as rodent damage.
H. Make sure that any upstream AC disconnects, as well as the dedicated circuit breakers for each AC
branch circuit, are functioning properly and are closed.
I. Disconnect and reconnect the DC PV module connectors. The status LED of each microinverter will
light solid green for a few seconds after connection to DC power and then flash green six times to
22
IQ8MC, IQ8AC, and IQ8HC Installation and Operation Manual
184 to 276 VAC*
© 2023 Enphase Energy Inc. All rights reserved.
IQ Gateway Installation and Operation
Three-phase service
L1 to L2 to L3
L1, L2, L3 to N
319 to 478 VAC*
184 to 276 VAC*
November 2023
USM-00006-2.0