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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.

Error code 217 indicates that something with the battery is not quite right. This usually does not imply a serious issue, but a visit to the site may be necessary. For ARK Battery: Measure the voltage in each battery and check the voltage. The voltage should be between 48-54V, with no more than a 0.5V difference between batteries. If the voltage is between 32-47.9V, the batteries will need to be support-charged using a separate DC power supply capable of delivering 51V (DC) and 5-8A. Charge all batteries to 52V and start the system. After this, the problem should be resolved. If the voltage is below 32V, the batteries need to be replaced. Please contact our Growatt Support at growatt@aprilice.se with pictures and information about the case for further help (including serial number, order number, and installer code). For APX Battery: If error code 217 appears on APX or if the APX battery is not visible on the OSS platform, please check the manual where description of issues for APX contains. If the manual does not resolve the problem, please check the MCS version and software of the battery & Power module (Version 15 & 18 are recommended). If the version is lower than version 15 or different between the Control Module (98034-P2) & the battery (APX 5.0P-B1), various problems may occur. It is recommended to update all components via Growatt or on-site using an update file and a USB stick. Please contact our Growatt support at growatt@aprilice.se for instructions.

Error code 302 indicates "No AC connection." Check that there is AC-side voltage to the inverter and note down the values or take pictures. If error code 302 persists despite the presence of voltage, please contact our Growatt support at growatt@aprilice.se.

Check that - RS485A and RS485B are connected correctly. - The address and baud rate for the smart meter should be as follows (instructions on how to do this are in the manual). For CHNT (TPM-C): Address: 004 Baud rate: 9600 For Eastron (TPM-CT-E & TPM-E): Address: 002 Baud rate: 9600 Information on how RS485A and RS485B should be connected in the COM connector is available in the respective manuals for all inverters. In very few cases, the RS485 cable may be damaged, so it is important to check that the cable is intact before troubleshooting is completed. This can usually be checked with measuring tools. If a smart meter is not installed but the inverter shows error code 401, change registers 122,180,533 to 0 in the OSS platform under the inverter settings.

For error code 405, a software update can often solve this problem. If error code 405 appears, please contact our Growatt support at growatt@aprilice.se.

Error code 409 indicates that the voltage in one or more strings is too high. When there is an alert for 409, the installer needs to check the voltage in the strings and ensure compliance with the datasheet and manual requirements. If the voltage is within the approved range, a software update can often solve the problem in most cases. Please contact our Growatt support at growatt@aprilice.se for further help.

Error code 400 means that the fan of the inverter is not spinning. Please check if the fan is spinning or not, and contact our Growatt support at growatt@aprilice.se for a solution.

Error code 411 means that something related to the control board in the inverter is faulty. In most cases, a software update can resolve the issue, and Growatt support needs to be contacted for the software update via growatt@aprilice.se.