...have you tried SETTO# command?
https://www.fadalcnc.com/media/pdf/Fadal%20Commands.pdf
If this isn't fixed yet try the Zero Memory command I believe. You have corrupt memory due to low voltage. It's in the DIAG section of the maintenance manual.
Function 5 = ZERO MEMORY
On the 1400-2 writes zeros to segments 6,8,9,A,B,C,D,E. On the 1400-3
writes zeros to segments 4,5,8,9,A,B,C,D,E.
WARNING:
This will clear all memory SETP, backlash user programs, tool and fixture
information.
Thanks for the feedback.