Dc Resistance Low - Power Off Condition; Other Faults; Troubleshoot An Inoperable Microinverter - enphase IQ7+ Installation And Operation Manual

DC Resistance Low – Power Off condition
For all IQ7 Microinverters, a solid red status LED when DC power has been cycled indicates the microinverter
has detected a DC Resistance Low – Power Off event. The LED will remain red, and the fault will continue to
be reported by the gateway until the error has been cleared.
An insulation resistance (IR) sensor in the microinverter measures the resistance between the positive and
negative PV inputs to the ground. If either resistance drops below a threshold of 7kΩ, the microinverter stops
power production and raises this condition. This may indicate defective module insulation, defective wiring
or connectors, moisture ingress, or a similar problem. Although the cause may be temporary, this
microinverter condition persists until the sensor is manually reset.
An IQ Gateway is required to clear this condition. The condition clears on operator command unless its
cause is still present.
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 Support at https:/
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 Enphase Installer Platform
1. Log in to Enphase Installer Platform and access the system.
2. Click the Events tab. The next screen shows a current DC Resistance Low - Power Off condition
for the system.
3. Click DC Resistance Low - Power Off.
4. Click the serial number of the affected microinverter.
5. Click Tasks and click Clear GFI to clear the event.

Other faults

All other faults are reported to the IQ
Operation 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 the DC power, and then watch for the solid green
light 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.
20
/enphase.com/contact/support.
. Refer to the Enphase IQ
Gateway
for troubleshooting procedures.
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IQ7+ and IQ7A Installation and Operation Manual - India
Gateway
Metered Installation and
August 2023
USM-00002-1.0