55
EN-US
*) If status code persists: Contact a Fronius-trained service technician
**) If status code persists: Contact your system installer
Class 5 state
codes
Class 5 state codes generally do not impair grid power feed operation, but can lead to lim-
itations. They will be displayed until the state code is acknowledged by pressing a key (the
inverter, however, continues working normally in the background).
458
Error during measuring signal detection
Inverter does not feed ener-
gy into the grid.
*)
459
Error during measuring signal detection
for insulation test
460
Reference voltage source for the digital
signal processor (DSP) is operating out-
side of tolerances
461
Error in DSP data memory
462
Error in DC feed-in monitoring routine
463
AC polarity reversed, AC connector
plugged in incorrectly
474
RCMU sensor faulty
Inverter does not feed ener-
gy into the grid.
**)
475
Insulation error (connection between so-
lar module and grounding)
476
Supply voltage for driver too low
479
Intermediate circuit voltage relay
switched off
The inverter will automati-
cally attempt to connect
again and, if possible, re-
sume feeding energy into
the grid
*)
480,
481
Function incompatibility (one or more PC
boards in the inverter are not compatible
with each other, e.g., after PC board re-
placement)
Inverter does not feed ener-
gy into the grid.
Update inverter firm-
ware; *)
482
Setup interrupted after initial commis-
sioning
Inverter does not feed ener-
gy into the grid.
Restart setup after AC
reset (switch automatic
circuit breaker off and
on)
483
Voltage U
DCfix
for MPP2 string is outside
of valid range
Inverter does not feed ener-
gy into the grid.
Check MPP settings; *)
485
CAN transmission buffer is full
Inverter does not feed ener-
gy into the grid.
Carry out AC reset
(switch automatic circuit
breaker off and on); *)
489
Permanent overvoltage at intermediate
circuit capacitor (status code 479 ap-
pears 5x one after the other)
Inverter does not feed ener-
gy into the grid.
*)
Code
Description
Behavior
Remedy
Code
Description
Behavior
Remedy
502
Insulation fault on solar mod-
ules
Warning message is
shown on the display
**)
509
No feed-in within the last
24 hours
Warning message is
shown on the display
Acknowledge state code;
Check whether all conditions for
problem-free grid power feed opera-
tion are met (e.g., whether solar mod-
ules are covered with snow); **)
