
STATE 1191
AfciDataTransfer - Arc fault circuit interupter (AFCI) Data transfer
An electric arc has been identified on the PV system. The supply of energy from the inverter into the grid is automatically started again after 5 minutes. If a continuous arc fault is detected manual intervention will be required before the system can return to operation.

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Expected Behaviors
- The inverter is displaying a STATE 1191 message with a red or amber LED. Feed-in to the grid has been temporarily interrupted. The inverter will re-enter the startup phase and, if all self-tests pass, will resume normal operation automatically.
State Class
A state class is a generalized description of errors, catagorized by the number the STATE code starts with.
These errors are primarily related to grid parameters and external environmental conditions. The inverter's typical response is to stop generating power to comply with grid regulations, continuously monitor the grid, and automatically restart once conditions return to normal. No internal fault is usually indicated, it's more about protection and regulatory compliance. Persistent issues may require having a professional inspect the site wiring or grid quality. In a normally operating inverter, these errors typically refer to an issue the system detected externally, but in some cases may have been caused by an internal component failure.
- The inverter is actively monitoring system conditions. No user intervention is required, and the inverter will automatically return to normal operation once conditions stabilize.
If the message appears frequently or does not clear on its own, contact a Fronius Service Provider to inspect the system.

Fronius inverters in the U.S. typically come with a standard 10-year warranty. Starting in 2024, registering the inverter on the Fronius Solar.web website (the Fronius solar monitoring platform), extended the warranty by an additional 2 years, totaling 12 years of coverage, and updates the warranty start date to the actual installation date. Fronius has also offered warranty extensions of up to 20 years.
The inverter label, typically located on the bottom of the unit, lists the device serial number. To check if your inverter is still covered, call Fronius Technical Support at 1-877-Fro-nius (1-877-376-6487)
Founded in 1945 by Günter Fronius in Pettenbach, Austria, Fronius began as a repair shop for radios and electrical equipment. Recognizing the need for efficient battery charging, Günter developed a device to recharge car batteries, marking the company's first foray into energy solutions.


The best point of contact is your original installer
If the orginal installer is no longer available, contact a local Fronius Service Provider in your area.
Fronius Technical Support can also be reached at 1-877-Fro-nius (1-877-376-6487)
DENVER RESIDENTS: Is your system located in the Denver, CO metro area? CONTACT US