6.1.9. Error 22, 23 - Internal temperature sensor failure
The internal temperature measurements are out of range. Disconnect all wires, and then reconnect all wires, to restart the unit.
This error will not auto-reset. If the error remains, please contact your dealer, there might be a hardware defect.
6.1.10. Error 26 - Terminal overheated
Power terminals overheated, check wiring, including the wiring type and type of strands, and/or fasten bolts if possible.
This error will auto-reset.
6.1.11. Error 27 - Charger short circuit
This error will auto-reset. If the error does not auto-reset disconnect the charge controller from all power-sources, wait 3 minutes,
and power up again. If the error persists the charge controller is probably faulty.
6.1.12. Error 28 - Power stage issue
This error will not auto-reset.
Disconnect all wires, and then reconnect all wires. If the error persists the charge controller is probably faulty.
Note that this error was introduced in v1.36. So when doing an update, it might look like the firmware update caused this issue;
but it doesn't. The Solar charger was then already not performing 100% before the update; updating to v1.36 or later merely made
the issue more visible. The unit needs to be replaced.
6.1.13. Error 29 - Over-Charge protection
This error will auto-reset. This protection looks at the actual battery voltage and compares this to the settings. In case your actual
voltage is above what is expected it shuts down to isolate the battery from the rest of the unit. Firstly check battery settings
(absorption/float voltages) to see if something is wrong here. Another possible cause is an over-sized PV array configuration, if
there are too many panels in series the battery voltage cannot be reduced any further. Consider modifying PV panel wiring to
reduce the PV voltage.
6.1.14. Error 43 - Inverter shutdown (Ground Fault)
The voltage difference between Neutral and Ground is too high.
Inverter or Multi (not connected to the grid):
• The internal ground relay is activated but the voltage over the relay is too high. The relay might be damaged.
Multi (connected to the grid):
• The ground wire in the installation is not present or not connected properly.
• Line and Neutral are swapped in the installation.
This error will not auto-reset. Check the installation and restart the unit using the power-switch.
6.1.15. Error 50, Error 52 - Inverter overload, Inverter peak current
Some loads like motors or pumps draw large inrush currents in a start-up situation. In such circumstances, it is possible that the
start-up current exceeds the over current trip level of the inverter. In this case the output voltage will quickly decrease to limit the
output current of the inverter. If the over current trip level is continuously exceeded, the inverter will shut down: wait 30 seconds
and then restart.
The Inverter can supply more power than the nominal power level for a short time. If the time is exceed the inverter stops.
After three restarts followed by another overload within 30 seconds of restarting, the inverter will shutdown and remain off. To
restart the inverter, switch it Off, then On.
If the error persists reduce the load on the AC out terminal by switching off or disconnecting appliances.
6.1.16. Error 51 - Inverter temperature too high
A high ambient temperature or enduring high load may result in shut down to over temperature. Reduce load and/or move
inverter to better ventilated area and check for obstructions near the fan outlets.
The inverter will restart after 30 seconds. The inverter will not stay off after multiple retries.
Inverter RS Smart
Page 17
Troubleshooting and Support