Troubleshooting 105
26 Inv
overtemperature
The inverter has performed a control board temperature trip and
has disconnected from the grid. The inverter’s control board
temperature has risen above the trip limit despite the output
current reduction function.
Check the installation environment temperature.
Note: The fault can be reset but will reactivate immediately if the
control board temperature has not fallen below the trip value.
Check if the cooling fan is running and that air is flowing out from
the rear of the inverter. A DC voltage over ~200V is required for
the fan to run.
Check that the cooling fan is clean: Turn the DC switch to ‘0’ and
remove the bottom cover. Remove, inspect and dry clean the
cooling fan with a vacuum cleaner or air blower. Replace the fan to
its position.
Check if the stirring fan is running: Turn the DC switch to ‘0’ and
remove the front cover. Turn the DC switch to ‘1’ and wait a few
minutes to see if the stirring fan starts running. A DC voltage over
200V is required for the fan to run.
Check that the stirring fan is clean: remove, inspect and dry clean
the stirring fan with a vacuum cleaner or air blower. Replace the
stirring fan to its position.
Replace the front and bottom covers.
Turn the DC switch to ‘1’ position. Try to reset the fault and
monitor if the inverter returns to normal operation.
If the inverter does not return to normal operation, power down the
inverter and contact your system supplier. Your system might:
• be connected to too many solar panels
• be installed in a location that is too hot
• have inadequate cooling air flow.
27 Ctlbrd
overtemperature
See description for fault message 26, Inv overtemperature.
28 Inv device The inverter has diagnosed a control error in the power
electronics.
Power down the inverter.
Restart the inverter.
If the inverter returns to the same fault state, power down the
inverter and contact your system supplier.
29 Relay The inverter has diagnosed a control error in one of the four AC
grid disconnection relays.
Power down the inverter.
Restart the inverter.
If the inverter returns to the same fault state, power down the
inverter and contact your system supplier.
Fault
message
ID code
Fault message
description
Causes of fault and corrective actions
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