APsystems YC600B Installation/User Manual
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6. Troubleshooting
Qualified personnel can use the following troubleshooting steps if the PV system does not
operate correctly:
6.1 Status Indications and Error Reporting
6.1.1 Start up LED
One quick red light followed by three short green blinks when DC power is first applied to
the Microinverter indicates a successful Microinverter startup.
6.1.2 Operation LED
Flashing Slow Green (10 sec. gap) - Producing power and communicating with ECU
Flashing Fast Green (2 sec. gap) - Producing power and not communicating with ECU over
60mins
Flashing Red - Not producing power
Steady Red - Electrode assembly ground fault protection
6.1.3 GFDI Error
A solid red LED indicates the Microinverter has detected a Ground Fault Detector
Interrupter (GFDI) error in the PV system. Unless the GFDI error has been cleared, the LED
will remain red and the ECU will keep reporting the fault.
After the ground fault error is fixed, follow the instructions in the ECU Installation and
Operation Manual to clear this GFDI error reporting.
6.1.4 Other Faults
All other faults are reported to the ECU. Refer to the ECU Installation and Operation
Manual for a list of additional faults and troubleshooting procedures.
Only qualified personnel should directly handle the APsystems Microinverter.
1
Never disconnect the DC wire connectors under load. Ensure that no current is
flowing in the DC wires prior to disconnecting.
2
Always disconnect AC power before disconnecting the PV module wires from the
APsystems Microinverter.
3
The APsystems Microinverter is powered by PV module DC power. AFTER
disconnecting the DC power, when reconnecting the PV modules to the
Microinverter, be sure to watch for the three short LED flashes.
