Enphase IQ8P Microinverters
24 © 2024 Enphase Energy Inc. All rights reserved. January 2024
IOM-00002-1.0
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 connectors under load.
WARNING: The Enphase microinverters are powered by DC power from the PV modules.
Ensure you disconnect the DC connections, reconnect the DC power, and then watch for
the solid green about six seconds after connection to DC power.
A. Ensure AC breakers and disconnects are closed.
B. Check the connection to the utility grid and verify that the utility voltage is within allowable
ranges.
C. Verify that AC line voltages at all solar power circuit breakers at the load center and
subpanels are within the ranges shown in the following table.
240 VAC, single-phase
L1 to L2 198 to 242 VAC
D. Using an IQ Disconnect Tool, disconnect the AC cable from the IQ Cable for the microinverter
in question.
E. Verify that utility power is present at the microinverter by measuring line to line and line to
ground 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 also for damage, such as rodent damage.
G. Ensure that any upstream AC disconnects, as well as the dedicated circuit breakers for each
AC branch circuit, are functioning properly and are closed.
H. Disconnect and re-connect the DC PV module connectors. The status LED of each
microinverter will light solid green a few seconds after connection to DC power and then blink
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 the
table on the previous page outlining LED indicators for normal operation.
I. 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 the AC is disconnected.
J. Verify the PV module DC voltage is within the allowable range shown in the Specifications in
this manual. Refer to the Enphase compatibility calculator at
https://enphase.com/en-ph/installers/microinverters/calculator to verify PV module
electrical compatibility with the microinverter.
K. Swap DC leads with a known good, adjacent PV module. If, after checking the Enphase
Installer Portal periodically (this may take up to 30 minutes), the problem moves to the
adjacent module, this indicates that the PV module is not functioning correctly. If it stays in
place, the problem is with the original microinverter.
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