Enphase IQ8P Microinverters
23 © 2024 Enphase Energy Inc. All rights reserved. January 2024
IOM-00002-1.0
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 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 https://enphase.com/en-ph/contact.
There are two ways 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 Portal
• Log in to the Enphase Installer Portal and access the system.
• Click the Events tab. The next screen shows the current “DC Resistance Low - Power Off”
condition of 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 Reset DC Resistance Low - Power Off Sensor.
• The system displays that a DC Resistance Low-Power Off reset task was issued on [date and
time] for this microinverter and is still pending.
Other faults
All other faults are reported to the gateway.
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