IQ8 / IQ8+ / IQ8M / IQ8A / IQ8H Micro Installation and Operation
26
© 2022 Enphase Energy Inc. All rights reserved.
Mar 2022
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. Make sure you
disconnect the DC connections and reconnect DC power and then watch for the solid green about six
seconds after connection to DC power.
A. Make sure 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.
D. Verify that AC line voltage at the junction box for each AC branch circuit is within the ranges shown in the
following table:
E. Using an Enphase disconnect tool, disconnect the AC cable for the microinverter in question from the Enphase
IQ Cable.
F. Verify that utility power is present at the microinverter by measuring line to line and line to ground at the
Enphase IQ Cable connector.
G. Visually check that the AC branch circuit connections (Enphase IQ Cable and AC connections) are properly
seated. Reseat if necessary. Check also for 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 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 page 24 for normal LED operation.
J.
Attach an ammeter clamp to one conductor of the DC cables from the PV module to measure microinverter
current. This will be under one amp if AC is disconnected.
K. Verify
the PV module DC voltage is within the allowable range shown in “Specifications” on page 33 of this
manual.
L. Swap DC leads with a known good, adjacent PV module. If after checking Enphase Installer Platform
periodically (this may take up to 30 minutes), the problem moves to the adjacent module, this indicates that the
240 Volt AC, Single Phase
L1 to L2
211 to 264 VAC
L1, L2 to ground
106 to 132 VAC
208 Volt AC, Single Phase
L1 to L2
183 to 229 VAC
L1, L2 to ground
106 to 132 VAC
