Examined Combi Oven unit found top dry air burner not firing and steam burner blower not turning all so not lighting no error.codes coming up 240v on incoming side of motor wiring harness needs to be replaced tried new control board same problem sub out module same problem will order e-prom. 6/25/19 returned for service replaced broken cable harness and installed nnea e-prom tried loading update software new software updated unit tested motors steam and top hot air not turning found second bad wire harness from brittle wiring tried subbing in new control board did not solve problem unit not communicating with control board will order new wiring harness and return. 6/26/19 returned for service switch usb cable from i/o board to top ignition module same problem 2 burner blowers not turning spoke with Jim from rational ran test on all communication system by errors coming up from disconnecting components in unit determine ignition module shorted and took out burner blower motors all so