Troubleshooting; Status Led Indications And Error Reporting; Led Operation; Dc Resistance Low - Power Off Condition - enphase IQ8 Installation And Operation Manual

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
Flashing orange
Flashing Red
Solid Red
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 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 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 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.
24
IQ8 / IQ8+ / IQ8M / IQ8A / IQ8H Micro Installation and Operation
Indicates
Normal operation. AC grid function is normal there is communication with the IQ
Gateway
The AC grid is normal but there is no communication with the IQ Gateway
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 Low – Power Off Condition" on page 24.
© 2022 Enphase Energy Inc. All rights reserved. Mar 2022