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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 are first applied to the microinverter indicate a failure during
microinverter startup.
DC Resistance Low – Power Off condition
For all IQ8P 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, 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
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 the Enphase Installer Platform
•
Log in to the Enphase Installer Platform and access the system.
•
Click the "Events" tab. The next screen shows a current "DC Resistance Low - Power Off"
condition for the system.
•
Click "DC Resistance Low - Power Off".
•
Where "n" is the number of affected devices, click "n devices (show details)".
•
Click the serial number of the affected microinverter.
•
Click "Tasks and Clear GFI" to clear the event.
Other faults
All other faults are reported to the gateway. Refer to the IQ Gateway Installation and Operation
Manual at
https://enphase.com/en-za/installers/resources/documentation
procedures.
22
IQ8P Microinverter Installation and Operation Manual
There is an active "DC Resistance Low – Power Off" condition. To reset,
refer to the IQ Gateway Installation and Operation Manual at:
https://enphase.com/en-za/installers/resources/documentation. If the
problem persists, measure resistance between PV+ to EARTH and then PV-
to EARTH on the PV module and then inverter. Anything less than ~7 kΩ will
trigger the "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.
https://enphase.com/contact/support
© 2023 Enphase Energy Inc. All rights reserved.
for troubleshooting
September 2023
IOM-00001-1.0
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