Other Faults; Troubleshoot An Inoperable Microinverter - enphase IQ7 Installation And Operation Manual

If a microinverter registers a "DC Resistance Low - Power Off" condition, you can attempt to clear this
condition. If the condition does not clear after you perform the following procedure, contact Enphase
Energy System customer support at enphase.com/en-us/support/contact.
There are two ways 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 1: Clear this error using Enphase Installer App
• Log in to the Enphase Installer App 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.
Method 2: Use the Enphase Installer App to clear the condition
Follow the instructions in the Enphase IQ Gateway Installation and Operation Manual at
enphase.com/support to clear this condition.

Other faults

All other faults are reported to the IQ
Manual at enphase.com/support

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 the connection to DC power.
A. Make sure the 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 the 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 the AC line voltage at the junction box for each AC branch circuit at the site is within
range:
Single-phase service
L1 to N
E. Using an IQ Disconnect Tool, disconnect the AC cable for the microinverter in question from the IQ
Cable.
22
. Refer to the Enphase IQ
Gateway
for troubleshooting procedures.
207 to 253 VAC L1 to L2 to L3
L1, L2, L3 to N
© 2023 Enphase Energy Inc. All rights reserved.
IQ Microinverters for AC Module applications
Installation and Operation
Gateway
Three-phase service
360 to 440 VAC
207 to 253 VAC (most models)
219 to 264 (IQ7A models)
June 2023
USM-00001-1.0