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Troubleshooting
Adhere to 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: 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
Startup LED Operation:
The status LED on the underside of each M250 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.
Six short red blinks after DC power is first applied to the microinverter indicate a
failure during microinverter startup.
Post-Startup LED Indications
Use a handheld mirror to view indicator lights on the undersides of the microinverters:
Flashing Green: Indicates normal operation. The microinverter is receiving messages from
the Envoy and senses that the utility grid is within voltage/frequency specifications.
Flashing Orange: Indicates that the microinverter is not receiving messages from the Envoy,
but is otherwise operating normally. The microinverter senses that the utility grid is within
voltage/frequency specifications.
Flashing Red: Indicates that the microinverter is not operating normally. The microinverter
does not sense that the utility grid is within voltage/frequency specifications. The
microinverter cannot produce power until this is resolved. See "Troubleshoot an Inoperable
Microinverter" on page 22.
Solid Red: DC resistance low fault. Troubleshoot as described in the following section.
DC Resistance Low Fault
A solid red status LED when DC power has been cycled indicates the microinverter has detected a DC
Resistance Low event. The LED will remain red and the fault will continue to be reported by the Envoy
until the error has been cleared.
An Envoy is required to clear this condition. The condition usually clears with operator intervention unless
conditions causing the event have not been remedied or if the failure is permanent.
Follow the instructions in the Envoy Communications Gateway Installation and Operation Manual at
http://www.enphase.com/support
support at support@enphase.com.
Other Faults
All other faults are reported to the Envoy. Refer to the Envoy Communications Gateway Installation and
Operation Manual at
http://www.enphase.com/support
21
to clear this condition. Or, for assistance, contact Enphase customer
for troubleshooting procedures.
2013 Enphase Energy Inc.
M250 Installation and Operation
141-00022 Rev 01
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