If your solar system has stopped producing power and your screen displays unusual messages, you might be dealing with one of several Xantrex inverter error codes. These fault messages help identify problems such as voltage mismatches, ground faults, or incorrect wiring—any of which can stop your inverter from operating or exporting to the grid.

Whether your Xantrex display reads "inverter offline", "ZC voltage fault", or only shows a red LED with a ground fault warning, this guide will help you understand the underlying cause and what you can do next. We’ve also included important information on system commissioning and how to get your unit restarted safely.

If your system remains offline after basic checks, call Solair Electrical to book a professional inspection. We service Xantrex inverters across Brisbane, Redlands, and the Gold Coast.

No Display – Inverter is Off Even in Sunlight

Possible Cause: AC and DC breakers are switched off.
Solution: Turn on the breakers in the sequence outlined in the commissioning procedure (AC last).

Inverter Offline + ZC Voltage Fault

Possible Cause: AC utility breakers are off or AC grid voltage is incorrect/missing.
Solution: Turn on the AC utility breakers. Check wiring at AC terminals and ensure voltage is within required specs.

Inverter Offline with Sufficient Sunlight

Possible Cause: DC breakers are off, DC fuses are blown, or array voltage is missing.
Solution: Check all DC isolators and fuses. Inspect PV array wiring and polarity.

Inverter Offline + DC Voltage Fault (Sunlight Present)

Possible Cause: Incorrect DC voltage or miswired PV array.
Solution: Check the DC terminal voltage and array wiring. Confirm voltage is within the Xantrex operating range.

Red LED Only + Ground Fault Message

Possible Cause: A ground fault is detected in the PV system.
Solution:

1. Turn off DC input
2. Turn off AC input
3. Locate and repair the ground fault (often due to insulation breakdown or moisture)
4. Restart the system using Xantrex’s commissioning sequence

A licensed solar electrician is recommended for this step—Solair Electrical can assist on 0405 685 441.

Inverter LCDs Show Different Power Values on a Shared Network

Possible Cause: Baud rate settings mismatch across daisy-chained inverters.
Solution: Use the Xantrex Baud Rate Change Procedure (document 976-0216-01-01) to verify and align all inverters’ baud rates. This will fix Tx/Rx errors.

Commissioning Procedure Summary (Xantrex GT Inverter)

To safely start your Xantrex inverter after installation or a reset:

1. Turn AC breaker off
2. Ensure DC wiring is properly connected
3. Ensure the AC quick connect (for GT 2.8-AU) is tightly secured
4. Uncover the PV array or turn on DC isolator
5. Switch the AC breaker on

Make sure the PV array voltage is within range and the inverter receives proper AC supply.

Xantrex Inverter Output Specs

Model	Max Output Power	Max Output Current	Nominal Voltage	Frequency	THD	Power Factor
GT 2.8-AU	2800W	14.0A	230V	50Hz	<3%	>0.99
GT 5.0-AU	5000W	24.0A	230V	50Hz	<3%	>0.99

Need Help with Xantrex Inverter Errors? Call Solair Electrical

Troubleshooting Xantrex inverter error codes can be complex—especially with faults like DC bus errors, ground faults, or communication failures. In some cases, restarting won’t resolve the issue and professional servicing is required to avoid further damage or safety risk.

At Solair Electrical, we’re experienced with Xantrex GT 2.8-AU and GT 5.0-AU inverters and offer full inspection, fault diagnosis, and system restoration services throughout South-East Queensland.

Call us on 0405 685 441 to book your Xantrex inverter inspection today. We'll get your solar system back online and performing at its best.