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Troubleshooting Reference Table
975-0053-01-01 4–5
Troubleshooting Reference Table
Problem Cause Remedy
Inverter CPU does not
illuminate the red or
green LEDs and does
not operate in sufficient
sunlight,
or the display reads “AC
Mains Not Present” or
the VDC reading is 0.
PVGFP, AC or DC breakers
are switched off.
No AC grid or DC array
voltage is present.
20 amp fuses on combiner
board are missing or open.
Turn on breakers in the sequence described in the
operation section.
Check AC connections and ensure 240 VAC is
present at the inverter’s AC disconnect. Check
DC connections and ensure 50–125 VDC is
present on the inverter’s disconnect.
Install combiner board fuses. Check PV array for
short circuits or improper sizing for the 20 amp
fuse.
The inverter CPU only
illuminates the red LED.
The green LED never
illuminates in a flashing
or solid mode,
or the display reads “AC
Mains Not Present” or
the VDC reading is 0.
The inverter does not
recognize any AC input
signal.
Inverter does not recognize
the appropriate DC signal.
Ensure the inverter AC disconnect is switched
on. Check the AC voltage at the inverter and
ensure AC voltage is present. Check source of
the AC voltage.
Check the DC voltage on the positive and
negative input terminals. The DC voltage must
be 50 volts or greater open circuit to initiate
inverter operation. Check for incorrectly wired
PV arrays or try again on a day with brighter
sunlight intensity.
The inverter illuminates
the red LED upon
startup and goes into a
flashing green mode.
The flashing green LED
continues for over 5
minutes and never
illuminates solid.
The inverter recognizes the
AC grid is present, but grid
voltage or frequency are not
within the appropriate
tolerances.
Check the AC voltage and frequency with a
multimeter/frequency meter. Wait for grid power
to return to acceptable voltage and/or frequency.
Notify the utility company that the voltage or
frequency is outside of the appropriate
boundaries.
The inverter CPU
illuminates a solid green
LED momentarily, then
flashes a red LED.
The inverter recognizes the
AC grid and DC array
voltages and attempts to
start selling power. The PV
panels are not producing
sufficient power for the
inverter to operate at a
stable DC voltage.
Check the DC input voltage at the inverter’s
positive and negative input terminals. The PV
array is not producing enough power. Wait for
sunlight intensity to increase and ensure the
panels produce sufficient voltage for inverter
initialization.