Arrived at location on 8/10/21 - located unit and began diagnosis. Control box was completely charred and wiring was destroyed. Tried to find a wiring diagram for unit but could not find one. Called manufacturer directly and requested a wiring diagram which they emailed to me. I then proceeded to cut back and strip any burnt wiring. I then crimped on all new terminal connectors and reconnected them. Reassembled control box and re-energized unit. Allowed 15 minutes for unit to heat up. Unit now operates to specification and placed back in service.