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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 customer service to obtain
an RMA (return merchandise authorization) number and start the replacement process.
Status LED Indications and Error Reporting
The following section describes LED indications.
LED Operation
LED color
Flashing green
Normal operation. AC grid function is normal there is communication with the Envoy.
Flashing orange
The AC grid is normal but there is no communication with the Envoy.
Flashing red
The AC grid is either not present or not within specification.
There is an active "DC Resistance Low, Power Off Condition." To reset, see "DC Resistance
Solid red
Low – Power Off Condition" on page 22.
The status LED on each microinverter lights green about six seconds after 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 DC power is first applied to the microinverter indicate a failure during
microinverter startup.
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 Envoy 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 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 Envoy 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 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 sensor reset if the cause of the failure is still present. If the condition persists, contact your installer.
22
© 2018 Enphase Energy Inc. All rights reserved.
IQ 7 / IQ 7+ / IQ 7X Micro Installation and Operation
Indicates
141-00043-02
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