This error is displayed from version 1.9.2 on and means that N and L are switched, which will subsequently damage and burn the motherboard.

To prevent this please follow Etrel INCH electrical and physical installation guides and the on the protection element, located inside the INCH charger.

3 phase connection:

• correct:

  

• wrong (L1 and N switched):

  

• wrong (L2 and N switched):

  

• wrong (L3 and N switched):

  

Please measure between each phase and ground. Results:

1 phase connection:

• correct:

  

•  wrong (switched L1 and N):
  
  

Please measure between phase and ground. Result: