103
EN
Service class 4
Some of the class 4 status codes necessitate intervention by a Fronius-trained service en-
gineer.
Code Description Behaviour Remedy
401 Communication error be-
tween Recerbo and power
stage set
1. Ribbon cable between pow-
er stage set and filter board
faulty or not connected proper-
ly
1. Check ribbon cable between
Recerbo and power stage set
2. Ribbon cable defective 2. Change ribbon cable
3. Recerbo not plugged in cor-
rectly
3. Check Recerbo plug
4. Recerbo defective 4. Change Recerbo
5. Power stage set defective 5. Change AC board
6. Filter board defective 6. Change filter board
406 Temperature sensor in DC
semiconductor module de-
fective
1. Defective temperature sen-
sor in semiconductor module
1. Change DC board
2. Defective circuit on the pow-
er stage set
2. Change DC board
407 Temperature sensor on the
power stage set
1. Defective temperature sen-
sor on the power stage set
1. Change AC board
2. Defective circuit on the pow-
er stage set
2. Change AC board
408 On the inverter an unac-
ceptably high DC injection
was detected
1. Asynchronous AC grid 1. Check AC grid
2. Power stage set defective 2. Change AC board
412 Adjusted fix voltage beyond
the accessible MPP range
1. Fix voltage was adjustable
too high or too low
1. Check adjustments in the
service menu
415 Wire shutdown tripped 1. Option card tripped a wired
shutdown
1. Automatically corrected, op-
tion card stopped the inverter
416 - 425 Communication error be-
tween power stage set and
Recerbo
1. Occurs once - PSP commu-
nication error
1. Automatically corrected
2. Unknown option card blocks
the inverter
2. Software update
3. Ribbon cable between filter
and power stage set defective
3. Change ribbon cable
4. Recerbo defective 4. Change Recerbo
5. Filter board defective 5. Change filter board
6. Power stage set defective 6. Change AC board
426 Charging intermediate cir-
cuit takes too long
1. Too less DC Power 1. Restart inverter or do a soft-
ware update
2. DC inductors not properly
connected
2. Check DC inductors screws
3. DC booster defect 3. Change DC board. After-
wards if necessary AC board
427 1. Software error 1. Update software
2. Measuring error on the pow-
er set
2. Change AC board
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