7.2 LCD Fault and Troubleshooting
The inverter will shut down automatically if the PV power generation system
fails, such as output short circuit, grid overvoltage/undervoltage, grid
overfrequency/underfrequency, high environmental temperature or internal
malfunction of the machine. The fault information will be displayed on the
LCD screen. Please refer to 6.4 History Record for detailed operation.
The causes of a fault can be identified based on the faults listed in Table 7-2
through Table 7-7. There are 4 types of fault: alarm, protection, warning and
hardware fault. Proper analysis is recommended before contacting post-
sales service to ensure your quickest time to resolution.
Table 7-2 LCD Troubleshooting WARNING
Fault Description / Instruction
When the inverter is displaying "ExtFanErr" and
the output power of the inverter is greater than
50% of it's rated output, do the following:
If the fan is spinning --> Replace the inverter
because the sensing circuit has a problem.
If the fan is not spinning --> Remove the 6 bolts
that are holding the two external fans in place.
Open the white, snap-on wire connector.
Measure the voltage between the pins
connected to the RED and BLACK wires.
If the voltage is below 6VDC --> Replace
the inverter.
If the voltage is higher than 6V -->
Replace the fan
Recommended solutions:
1. Observe for 5 minutes to see whether the
alarm will be eliminated automatically.
2. Contact post-sales service if not corrected
Recommended solutions:
1. Visually check the DC Surge Protection
Device (SPD)
2. If the indicator is "red" --> Replace the
SPD module.
3. If the indicator is "green" --> Remove and
reinstall SPD module in the socket.
Contact post-sales service if not corrected
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