Class 3 Status
Class 3 includes status codes that may appear during grid power feed operation and do
Codes
not cause permanent interruption of the grid power feed operation.
After automatic disconnection from the grid and waiting for its conditions to return to those
stipulated, your inverter will try to resume grid power feed operation.
Code
Description
301
Over-current (AC)
302
Over-current (DC)
Power stage set over tempera-
303
ture
304
Interior temperature too high
LOW PV POWER
Intermediate circuit voltage
306
has dropped below permissible
threshold value for grid power
feed operation.
LOW PV VOLTAGE
DC input voltage has dropped
307
below permissible threshold
value for grid power feed oper-
ation.
IMPORTANT! Status codes 306 (LOW PV POWER) and 307 (LOW PV VOLTAGE) appear naturally every
morning and evening due to low solar irradiance. These status codes are not the result of a fault.
308
Intermediate circuit overvolt-
age
309
DC input voltage too high
Class 4 Status
Class 4 status codes may require the intervention of a trained Fronius service technician.
Codes
Code
Description
No internal communication
401
with power stage set.
Power stage set temperature
406
sensor defective
Internal temperature sensor
407
defective
408
DC feed-in detected
42
Details
Brief interruption of grid power
feed operation due to overcur-
rent in the inverter.
The inverter returns to the
startup phase.
Brief interruption of grid power
feed operation due to over
temperature.
The inverter returns to the
startup phase.
Brief interruption of grid power
feed operation.
The inverter returns to the
Startup phase.
Brief interruption of grid power
feed operation.
The inverter returns to the
Startup phase.
Details
The inverter will automatically
attempt to connect again and,
if possible, resume grid power
feed operation.
Rectification
Error is automatically rectified;
if status code persists: contact
a Fronius-trained service tech-
nician.
If required, clean cool air vents
and cooling elements with
compressed air.
The fault is rectified automati-
cally.
If this status code keeps recur-
ring, contact your system in-
staller.
The fault is rectified automati-
cally.
If this status code keeps recur-
ring with sufficient solar irradi-
ance, contact your system
installer.
Error is automatically rectified;
if status code persists: contact
a Fronius-trained service tech-
nician.
Rectification
If status code persists: contact
a Fronius-trained service tech-
nician.