What do I do when error code 203 occurs?

All Growatt inverters sold by Aprilice perform an insulation resistance test between the panels and ground before starting. If the Growatt inverter detects any issues, error code 203 will be triggered. To troubleshoot this problem, a resistance measurement needs to be conducted to ensure that the strings do not have a resistance lower than 50KΩ.

If no issues are found in the strings, the installer can change register 125 to 0 in the inverter settings on the OSS platform. If this does not resolve the issue, please contact our Growatt support at growatt@aprilice.se for further support.