IQ8AC/IQ8HC Installation and Operation Manual
22 © 2023 Enphase Energy Inc. All rights reserved. June 2023
USM-00005-2.0
Follow the steps below to send a clear message to the microinverter. Note that the condition will not clear
after the sensor reset if the cause of the failure is still present. If the condition persists, contact your
installer.
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 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 IQ Gateway Installation and Operation
Manual at https://enphase.com/en-au/installers/resources/documentation for troubleshooting
procedures.
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.
L1 to N 184 to 276 VAC*
L1 to L2 to L3 319 to 478 VAC*
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