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Troubleshooting
Follow all the safety measures described in 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
(RMA) 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 flashes. 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 IQ8 Series 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 7 kΩ, the microinverter stops power
production and raises this condition. This may indicate defective module insulation, 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
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 the 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.
Click Tasks and Clear GFI to clear the event.
5.
25
IQ8MC, IQ8AC, IQ8HC, and IQ8X Microinverters Installation and Operation Manual
Enphase Support
Indicates
Normal operation. AC grid function is normal and 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 the specification
There is an active DC Resistance Low, Power Off Condition. To reset, see DC Resistance
Low – Power Off Condition below. Refer to
the problem persists, measure the resistance between PV+ to EARTH and then PV- to EARTH
on the PV module and the inverter. Anything less than ~7 kΩ will trigger DC Resistance Low -
Power Off condition. Usually, the value is in MΩ on the inverter or PV module. Swap out faulty
PV module or microinverter.
© 2023 Enphase Energy Inc. All rights reserved.
to obtain a return merchandise authorization
IQ Gateway Installation and Operation
Enphase
Support.
Manual. If
November 2023
USM-00008-2.0
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