DMEGC AC Module Installation Manual
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5. 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.
5.1 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 Microinverter for ACM 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 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