Maintenance and Troubleshooting
Identifying Error/Fault Conditions and Solutions
Most error or fault conditions will be identified by fault message screens on the GT Inverter front panel LCD. These are described in the “Fault Mode” section on page
See “Front Panel Display Screens and What They Mean” on page
Table
Table
| Problem | Possible Cause | Solution |
|
|
|
The inverter’s LEDs and display are | Utility service panel AC and DC | Turn on the breakers in the sequence |
blank and the inverter does not | breakers are switched off. | described in “Commissioning |
operate in sufficient sunlight. |
| |
|
|
|
The display reads “Inverter Offline” | Utility service panel breakers are | Turn on utility panel breakers. |
and “AC Voltage Fault.” | switched off. |
|
| AC grid voltage is not present or | Check AC connections at the |
| incorrect. | inverter’s terminals. Ensure AC |
|
| voltage within the range specified in |
|
| “Output” on page |
|
|
|
The display reads “Inverter Offline” | DC breakers are switched off (if | Turn on any DC breakers and check |
with sufficient sunlight. | installed), or external DC fuses are | any DC fuses. |
| blown (if installed). |
|
| DC array voltage is not present. | Check DC connections at the |
|
| inverter’s positive and negative DC |
|
| terminals. Check for incorrectly |
|
| wired PV arrays. |
|
|
|
The display reads “Inverter Offline” | DC voltage is present but incorrect. | Check DC connections at the |
and “DC Voltage Fault” with |
| inverter’s positive and negative DC |
sufficient sunlight. |
| terminals. Check for incorrectly |
|
| wired PV arrays. Ensure a voltage of |
|
| |
|
| inverter’s terminals. |
|
|
|
Only the inverter RED LED is illuminated and the display reads “Ground Fault.”
Ground fault condition detected on the PV array.