What to do if Monarch nice3000 Controller shows Err02?
- AAngel BrewerSep 2, 2025
If the Monarch Controller displays Err02, it indicates that the main circuit output is grounded or short-circuited. To resolve this, check the RUN contactor at the controller output side to ensure it is working correctly. Also, verify that the shorting PMSM stator contactor is not causing a short circuit at the controller output side.