Troubleshooting; Status Led Indications And Error Reporting; Led Operation; Dc Resistance Low - Power Off Condition - enphase IQ7 Installation And Operation Manual

4 Troubleshooting

Follow all the safety measures described throughout this manual. Qualified personnel can use
the following troubleshooting steps if the PV system does not operate correctly.
WARNING: Risk of electric shock. Do not attempt to repair the Enphase
microinverter; it contains no user-serviceable parts. If it fails, contact Enphase
support to obtain an RMA (return merchandise authorization) number and start the
replacement process.

4.1 Status LED indications and error reporting

The following section describes LED indications.
4.1.1

LED operation

LED color
Flashing green Normal operation. AC grid function is normal; there is communication with the IQ Gateway.
Flashing orange The AC grid is normal, but there is no communication with the IQ Gateway.
Flashing red The AC grid is either not present or not within specification.
Solid red There is an active "DC Resistance Low, Power Off Condition." To reset, see
– Power Off
The status LED on each microinverter glows green about six seconds after the DC power is applied. It
remains lit solid for two minutes, followed by six green blinks. After that, red blinks indicate that no
grid is present if the system is not yet energized.
Any short red blinks after the DC power is first applied to the microinverter indicate a failure during
microinverter startup.
4.1.2 DC Resistance Low – Power Off Condition
For all IQ Series models, 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 IQ 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, 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
Support at enphase.com/en-us/support/contact.
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IQ7/IQ7+/IQ7X/IQ7A Microinverters Installation and Operation Manual
Indicates
Condition.
© 2023 Enphase Energy Inc. All rights reserved.
DC Resistance Low
September 2023
IOM-00028-1.0