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
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 Envoy-S 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 Customer
Support at https://enphase.com/en-us/support/global-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 or Enphase for possible replacement.
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