What do I do when error code 401 occurs?

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.