88
Class 4 status
codes
Some of the class 4 status codes necessitate intervention by a Fronius-trained service en-
gineer.
Remedy Fault is rectified automatically
If this status code keeps recurring, contact your system engi-
neer
IMPORTANT! Due to the low level of insolation early in the morning and in the evening,
the status code 307 (DC low) is routinely displayed at these times of day. This status code
does not indicate any kind of fault.
309
DC input voltage too high
Behaviour Short-term interruption while feeding energy into the grid
The inverter resumes with its startup routine.
Remedy Fault is rectified automatically
If this status code keeps recurring, contact your system engi-
neer
321
Overcurrent (AC)
Behaviour Short-term interruption while feeding energy into the grid due to
a grid fault or a power module fault
The inverter resumes with its startup routine.
Remedy Fault is rectified automatically
If this status code keeps recurring, contact your system engi-
neer
322
Overtemperature on the air intake sensor
Behaviour Permanent interruption while feeding energy into the grid
Remedy Reduce the ambient temperature and ensure that a suitable hot
air extractor is installed if necessary
If this status code keeps recurring, contact your system engi-
neer
401
No communication with power stage set possible
Behaviour The inverter will automatically attempt to connect again and, if
possible, will resume feeding energy into the grid
Remedy If the status code is displayed all the time: notify a Fronius-
trained service engineer
406
Power module temperature sensor defective
Behaviour The inverter is disconnected from the grid for safety reasons.
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