IQ8MC/IQ8AC/IQ8HC Installation and Operation Manual
21 © 2023 Enphase Energy Inc. All rights reserved. September 2023
IOM-00029-1.0
Method: Clear this error using Enphase Installer Platform
• Log in to Enphase Installer Platform 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.
• Where "n" is the number of affected devices, click n devices (show details).
• 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 IQ Gateway Installation and Operation Manual at
https://enphase.com/en-gb/installers/resources/documentation
for troubleshooting procedures.
5.2 Troubleshoot an inoperable microinverter
To troubleshoot an inoperable 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 and 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:
*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
indicate normal startup operation about two minutes after connecting to DC power. The LED
subsequently resumes normal operation if the grid is present. See normal LED operation
.
J. Connect a clamp meter to one of the conductors of the DC cables from the PV module to measure
the microinverter current. This will be under 1 A if AC is disconnected.
K. Verify the PV module DC voltage is within the allowable range shown in Specifications
. Refer to the
Enphase Compatibility Calculator to verify PV module electrical compatibility with the microinverter.
Single-phase service Multi-phase service
L1 to N 184 to 276 VAC*
L1 to L2 to L3 319 to 478 VAC*
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