11.5. Charger error code overview
This overview lists all possible error codes that can be generated by a solar charger or AC charger.
The error codes are displayed on the charger display, remote display or via a connected GX device.
Note that not all of these errors might apply to your charger model. Some error types only apply for solar
chargers, for AC chargers or are specific only to certain models within a charger group.
Error 2 - Battery voltage too high
The battery voltage is higher than expected. This error can be due to other charging equipment connected to the battery or a fault
in the charger. This error can also occur if the battery voltage (12, 24, 36 or 48V) is set to a lower voltage than the connected
battery. This error will auto-reset after the battery voltage has dropped.
Error 3 and/or 4 - Remote temperature sensor failure
Check if the T-sense connector is properly connected to a remote temperature sensor. Most likely cause: the remote T-sense
connector is connected to the BAT+ or BAT- terminal. This error will auto-reset after proper connection.
Error 5 - Remote temperature sensor failure (connection lost)
Check if the T-sense connector is properly connected to a remote temperature sensor. This error will not auto-reset.
Error 6 and/or 7 - Remote battery voltage sense failure
Check if the V-sense connector is properly connected to the battery terminals. Most likely cause: the remote V-sense connector is
connected in reverse polarity to the BAT+ or BAT- terminals.
Error 8 - Remote battery voltage sense failure (connection lost)
Check if the V-sense connector is properly connected to the battery terminals.
Error 17 - Controller overheated despite reduced output current
This error will auto-reset after charger has cooled down. Check the ambient temperature and check for obstructions near the heat
sink.
Error 18 - Controller over-current
This error will auto-reset. If the error does not auto-reset disconnect the charger from all power-sources, wait 3 minutes, and
power up again. If the error persists the charger is probably faulty. A cause for this error can be switching on a very large load on
the battery side.
Error 20 - Maximum Bulk-time exceeded
For solar chargers:
The maximum bulk time protection is a feature that was in the chargers when they were just released (2015 or earlier) and later
the feature was removed.
If you do see this error, then update to the latest firmware.
If you then still have the error, perform a reset to factory defaults of the configuration, and reconfigure the solar charger.
For AC chargers:
This protection is by default enabled on the Skylla-i and the Skylla IP44.
This error is generated when the battery-absorption-voltage is not reached after 10 hours of charging.
The feature of this safety protection is to detect a shorted cell; and stop charging.
Error 21 - Current sensor issue
The current measurement is out of range.
Disconnect all wires, and then reconnect all wires, to make the charger restart. Also, make sure the minus on the MPPT charge
controller (PV minus/Battery minus) is not bypassing the charge controller.
This error will not auto-reset.
If the error remains, please contact your dealer, there might be a hardware defect.
Error 24 - Fan failure
This error indicates that the fan is powered on but the circuit does not measure any current draw by the fan. Most likely its either
broken or obstructed.
Please contact your dealer, there might be a hardware defect.
Error 26 - Terminal overheated
MPPT solar charger manual
Page 64
Appendix
