Hesston 700712845 is the control box (monitor) used on 3‑baler accumulator models of the Hesston big square baler line. Common failures in this class include power supply dropout, relay or contactor burn‑out, and loss of communication with the baler drives; the controller’s LCD/indicator LEDs may show error codes such as “E01” (communication failure) or “E02” (over‑current). First‑check diagnostics: verify 48 V DC input to the control board, inspect all relays and contactors for signs of arcing or damage, and review any displayed fault codes on the monitor’s panel. If power is present but errors persist, perform a visual inspection of wiring harnesses for loose connections or corrosion before proceeding to internal component testing.[oss-gpt-20b]