Troubleshooting an Enphase System
2014 Enphase Energy Inc. August 2014
For M190, M210, D380 and for M215-60-2LL-S22, S23, or S24, this
indicates a GFDI fault.
Troubleshoot as described in “GFI Tripped on page 41 or "DC Resistance
Low" on page 37.
The Microinverter LEDs are flashing red
To determine the problem, perform the following checks.
1. Check DC voltages. Use a voltmeter to measure the PV modules VOC (Open Circuit Voltage)
and inspect the positive and negative markings on the PV module and microinverter.
2. Check AC voltages. Are all of the phase conductors running to the microinverter branch circuits
showing the appropriate nominal AC voltage? Measure line-to-line and line-to-neutral for all
phase-conductors. An electrician must measure hot legs and neutral to ensure that the phases
are balanced.
3. Is the system energized? Are the solar circuit breakers in the “ON” position? For the
microinverters to produce, the circuit breakers for the solar have to be in the “ON” position in the
electrical load center.
The Microinverter LEDs are flashing orange
Orange flashing lights indicate that the microinverters are producing power, but not communicating with
the Envoy.
1. Is there an Envoy plugged in and operating at the site? If so, what does the Communication
Check show? This is likely a communications issue. See “Power Line Communication Issues
between the Envoy & Microinverters” on page 21. If not, the microinverters will continue to flash
orange until an Envoy is installed.
The Microinverter LEDs are not lit
No lights indicate that the microinverter is not receiving power from the PV module.
1. Are the PV modules connected to the microinverters? PV modules power the microinverters, and
microinverters cannot operate unless powered.
2. Does the site use adaptors (or jumpers) between the PV module and the microinverter? It may be
that polarity is reversed. Does the site use Tyco connectors? If so, be warned that some Tyco
connectors will mate but reverse polarity. Refer to the microinverter product manual to make sure
that the appropriate lead from the PV module is connected to the appropriate DC lead on the
microinverter.
Power Production
This section describes how to troubleshoot power production issues by using Enlighten Manager
The unit under review shows low production.
1. Eliminate shading as a possible cause.
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