Other Faults; Troubleshoot An Inoperable Microinverter - enphase IQ8MC Installation And Operation Manual

Method: Clear this error using the Enphase Installer Platform
Log in to the Enphase Installer Platform and access the system.
Click the Events tab. The next screen shows a current DC Resistance Low - Power Off condition
1.
for the system.
Click DC Resistance Low - Power Off.
2.
Click the serial number of the affected microinverter.
3.
Click Tasks and Clear GFI to clear the event.
4.

Other faults

All other faults are reported to the gateway. Refer to the IQ Gateway Installation and Operation
Manual at https://enphase.com/installers/resources/documentation

Troubleshoot an inoperable microinverter

To troubleshoot an inoperable microinverter, follow these steps.
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. Disconnect the
DC connections and reconnect the DC power, and then watch for the solid green light for about six
seconds after connection to DC power.
A. Ensure AC circuit breakers and disconnects 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 subpanels are within the ranges
shown in the following table.
In Mexico,
**
D. Using an IQ Disconnect Tool, disconnect the AC cable for the specific microinverter from the IQ Cable.
E. Verify that utility power is present at the microinverter by measuring line-to-line voltage and line-to-ground
voltage at the IQ Cable connector.
F. 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.
G. Ensure that any upstream AC disconnects, and the dedicated circuit breakers for each AC branch circuit are
correctly functioning and closed.
H. Disconnect and re-connect the DC PV module connectors. The status LED of each microinverter lights solid
green for a few seconds after connection to DC power and then flashes green six times to indicate normal
start-up operation about two minutes after connecting to DC power. The LED subsequently resumes normal
operation if the grid is present. See page 25 for normal LED operation.
27
IQ8MC/IQ8AC/IQ8HC Microinverters Installation and Operation Manual
240 VAC, single-phase
L1 to L2
L1, L2 to ground
208 VAC, single-phase
L1 to L2
L1, L2 to ground
220 VAC, single-phase **
L1 to L2
L1, L2 to ground
only IQ8HC supports a 220 V grid.
© 2023 Enphase Energy Inc. All rights reserved.
for troubleshooting procedures.
211 to 264 VAC
106 to 132 VAC
183 to 229 VAC
106 to 132 VAC
198 to 264 VAC
106 to 132 VAC
October 2023
USM-00008-1.0