Troubleshooting an Inoperative
Microinverter
There are two malfunction possibilties:
a) The microinverter itself may be experiencing problems.
b) The microinverter is working, but it is having trouble communicating with the
DMU. The items below refer to microinverter issues, which exclude communication
issues (addressed in the DMU installation and user manual).
Quick ways to tell whether the issue is inside the microinverter or a
communication problem with the DMU include:
1. Diagnosing the Microinverter: A red LED light – either blinkingor solid, or no light
at all. No light, or red light indicates a malfunction within the microinverter.
2. Diagnosing from the DMU:
• No-Data-Display: This is probably a communication issue- not a
microinverter problem.
• Problems with erratic display: Data is displayed for randomperiods of time:
most likely a communication issue.
• 0 W, or 2 W: Possibly a microinverter problem
• Erratic data display: Poor coordination with data displays fromother units
indicates a likely a microinverter malfunction.
To troubleshoot an inoperative microinverter, follow
the instructions below:
1. Verify that the utility AC voltage and frequency are within the ranges
indicated in the Technical Data section of this manual.
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 microinverteris transmitting power. Re-connect the DC module
connectors andwatch for three short LED flashes.
3. Check the AC branch circuit interconnection between all the microinverters. Verify
each inverter is energized by the utility grid as described in the previous step.
4. Make sure that the AC breakers are functioning properly and are closed.
5. Check the DC connections between the microinverter and the PV module.
6. Verify that the PV module DC voltage is within the allowable
range indicated in the Technical Data of this manual.
7. If the problem persists, please call Customer Support.
WARNING: Do not attempt to repair the microinverter. If troubleshooting methods
fail, please call for Technical Support
Maintenance
Maintenance is not required.
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