Plug-In Solar Ltd
289 London Road | Burgess Hill | West Sussex | RH15 9QU
www.pluginsolar.co.uk | info@pluginsolar.co.uk | 01444 672005 Page 31
APPENDIX 4. TROUBLESHOOTING MICRO-INVERTERS
Status Indications and Error Reporting
Startup LED
When DC power is first applied to the Micro-Inverter: Five short green blinks indicate a successful
Micro-Inverter startup.
Operation LED
Flashing Slow Green (4s gap) - Producing power and communicating with DTU
Flashing Fast Green (2s gap) – Producing power and not communicating with ECU
Flashing Red – Not producing power (AC Grid Invalid – Voltage or Frequency out of range).
GFDI Error
A solid red LED indicates the Micro-Inverter has detected a ground fault (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.
Non-Operating Micro-Inverters
1.
To troubleshoot a non-operating Micro-Inverter, follow the steps below in order:
2.
Check the connection to the utility grid. Verify utility power is present at the inverter in question
by removing AC, then DC power. Never disconnect the DC wires while the Micro-
Inverter is producing power. Re-connect the DC module connectors and watch for three
short green LED flashes.
!
3.
Check the AC branch circuit interconnection between all the Micro-Inverters. Verify each micro-
inverter is energised by the utility grid as described in the previous step.
!
4.
Make sure that any AC breakers are functioning properly and are closed.
5.
Check the DC connections between the Micro-Inverter and the PV module.
!
6.
If the problem persists, please contact Hoymiles customer support on (+44) 028 2076 9210 or
email support_ie@hoymiles.com. DO NOT attempt to repair the Micro-Inverter. If
troubleshooting methods fail, please return the Micro-Inverter to your distributor for
replacement.
!