Sounds like it lost its parameters. Check some F1 parameters to confirm, especially spare inputs and output. You’ll have to default the CPU and re-enter all the F1 parameters the. You can load the F7 parameters from the CTL and be back up. Don’t try to just change all the parameters without defaulting. You put up all the odd dip switches then press all 4 buttons, N, S, +, -. Then enter everything from the paperwork that came with the job.