98
Class 4 Service
Codes
Class 4 status codes may require the intervention of a trained Fronius service technician.
303 Heat sink temperature too
high
1. Ventilation opening blocked 1. Clean openings
2. Ambient temperature too
high
2. Change setup location
3. Internal or external fans not
connected
3. Connect fan cable
4. Internal or external fans
faulty
4. Replace fans
5. Bad contact: power module
<--> heat sink
5. Check phase change paste
6. Measurement error on pow-
er module
6. Replace AC PC board
7. Ventilator power on Recerbo
faulty
7. Replace Recerbo
306 POWER LOW 1. DC power too low for infeed 1. Wait for more radiation in-
tensity or check solar modules
2. Measurement error on pow-
er module
2. Replace DC PC board. Oth-
erwise replace AC PC board
307 DC LOW 1. Open the main DC switch. 1. Close the main DC switch.
2. PV generator not connected 2. Connect PV generator
3. DC voltage too low for infeed 3. Wait for more radiation in-
tensity or check solar modules
4. Reverse voltage of PV gen-
erator
4. Reverse polarity of PV gen-
erator
5. DC operating mode: fixed
voltage + incorrect voltage
5. Check MPP settings/voltag-
es
6. Measurement error on pow-
er module
6. Replace DC PC board. Oth-
erwise replace AC PC board
308 The intermediate circuit
voltage exceeds max. per-
missible limit
1. Voltage drop in alternating
current grid
1. Automatic correction
2. Bad contact: wall bracket <-
-> inverter
2. Check fixing screws in DAT-
COM area
3. Measurement error on pow-
er module
3. Replace AC PC board
309 DC1 voltage too high 1. PV generator voltage at
MPP 1 too high
1. Check PV configuration
2. Incorrect DC cabling at MPP
1
2. Check DC cabling
3. Measurement error on pow-
er module
3. Replace DC PC board. Oth-
erwise replace AC PC board
313 DC2 voltage too high 1. PV generator voltage at
MPP 2 too high
1. Check PV configuration
2. Incorrect DC cabling at MPP
2
2. Check DC cabling
3. Measurement error on pow-
er module
3. Replace DC PC board. Oth-
erwise replace AC PC board
Code Description Behavior Remedy
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