APsystems Microinverter QT2-208 Installation Manual 16
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
Assuming they are easily accessible and visible, Operation LEDs can give a good indication of
the microinverters status
6.1.1 Start up LED
Ten 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 (5 sec. gap) - Producing power and communicating with ECU
Flashing Slow Red (5 sec. gap) - Not producing power
Flashing Fast Green (2 sec. gap) - Not communicating with ECU over 60mins, but still
producing power.
Flashing Fast Red (2 sec. gap) - Not communicating with ECU over 60mins and not
producing power.
Steady Red – default, DC side ground fault protection, see 6.1.3
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. Please contact your local
APsystems Technical Support.
6.2 ECU_APP
APsystems ECU_APP (available in the EMA Manager APP) is the recommended tool to do
on-site troubleshooting. When connecting the ECU_APP to the ECU hotspot (please check
ECU User Manual for more detailed information), installer can check every microinverter
status (production, communication) but also ZigBee signal strength, grid profile and other
insightful data helping the troubleshooting.
6.3 Installer EMA (web portal or EMA Manager APP)
Before going on site for troubleshooting, installer can also check all information remotely
using his installer account, either on the web or using the EMA Manager APP (see EMA
Manager APP User Manual for more detailed information). Having access to module data (DC,
AC, voltages and currents) gives the first indication on potential issues.
6.4 Trouble Shooting Guide
Professional installers can also refer to our Troubleshooting Guide
(
https://latam.apsystems.com/resources/library/
) for more in depth guidelines on how to
troubleshoot and fix PV installations powered by APsystems microinverters.
6. Troubleshooting
