Fronius Class 3 State Error Codes

Fronius Class 3 State errors – Class 3 includes status codes that may occur while feeding energy into the grid, but generally do not cause the process to be interrupted for any length of time. The inverter disconnects automatically from the grid, the grid is then monitored as specified and the inverter attempts to resume feeding energy into the grid.

Code	Description	Behavior	Remedy
STATE 301	Overcurrent (AC)	Short-term interruption while feeding energy into the grid due to overcurrent in the inverter. The inverter resumes with its startup routine.	The fault is rectified automatically; if this STATE code is displayed all the time: notify your local Fronius service partner.
STATE 302	Overcurrent (DC)
STATE 303	The power stage set over temperature	Short term interruption while feeding energy into the grid due to over temperature. The inverter resumes with its startup routine.	Purge openings for cooling air and heat sink if necessary; the fault is rectified automatically; if this STATE code keeps recurring contact your solar power system installer.
STATE 304	Internal temperature too high
STATE 306	LOW PV OUTPUT Intermediate circuit voltage too low for feeding energy into the grid	Short term interruption while feeding energy into the grid. The inverter resumes with its startup routine.	The fault is rectified automatically; if this STATE code occurs when there is sufficient insolation (sunlight) contact your solar power system installer. IMPORTANT! Due to the low level of insolation (sunlight) early in the morning and in the evening, the STATE codes 306 (LOW PV OUTPUT) and 307 LOW PV VOLTAGE) are displayed routinely at these times of the day. These STATE codes do not indicate any kind of fault.
STATE 307	LOW PV VOLTAGE DC input voltage too low for feeding energy into the grid
STATE 308	Intermediate circuit overvoltage	Short term interruption while feeding energy into the grid. The inverter resumes with its startup routine.	The fault is rectified automatically; if this STATE code is displayed all the time: notify your local Fronius service partner.
STATE 309	DC input voltage MPPT 1 too high
STATE 313	DC input voltage MPPT 2 too high