Class 4 service codes require in some cases the intervention of a trained Fronius service technician. Code
Designation
Description
Repair
401
no internal communication with power stage
If it is possible, your FRONIUS IG unit will resume the power feeding operation after successfully completing another attempt to connect
If an error code is displayed permanently, you should contact a Fronius trained service technician
402
no internal communication with ENS
If it is possible, your FRONIUS IG unit will resume the power feeding operation after successfully completing another attempt to connect
If Service-Code is displayed permanently, you should contact a Fronius trained service technician
403
EEPROM faulty
If it is possible, your FRONIUS IG unit will resume the power feeding operation after successfully completing another attempt to connect
If Service-Code is displayed permanently, you should contact a Fronius trained service technician
404
No communication possible between the control unit and ENS
If it is possible, your FRONIUS IG unit will resume the power feeding operation after successfully completing another attempt to connect
FRONIUS IG has no network connection. Check if the mains supply isolator is switched on If Service-Code is displayed permanently, you should contact a Fronius trained service technician
405
Incorrect or faulty ENScard
If it is possible, your FRONIUS IG unit will resume the power feeding operation after successfully completing another attempt to connect
If Service-Code is displayed permanently, you should contact a Fronius trained service technician
406
AC temperature sensor faulty
FRONIUS IG disconnects from the mains supply for safety reasons
If Service-Code is displayed permanently, you should contact a Fronius trained service technician
407
DC temperature sensor faulty
FRONIUS IG disconnects from the mains supply for safety reasons
If Service-Code is displayed permanently, you should contact a Fronius trained service technician
408
Direct current input
FRONIUS IG disconnects from the mains supply for safety reasons
If Service-Code is displayed permanently, you should contact a Fronius trained service technician
409
No +15V supply available for the control electronics
FRONIUS IG does not switch itself onto the mains supply.
If Service-Code is displayed permanently, you should contact a Fronius trained service technician
69
EN
Class 4
