How much more difficult is it to troubleshoot a trane voyager rtu?? I don't have any experience with these units.. I was sent out to change an ignition board on one of these units that was diagnosed by another tech.. I installed the board and nothing operated .. Even the fan would not start on a call. The wiring diagram on the unit had no lines connecting components . Only numbers? The only thing I thinking was the main board was not sending out control voltage . Did not really feel comfortable diagnosing this unit..Had to call boss and tap out on this problem .. Might be getting fired for it.. Been at this commercial company for a couple weeks now.. Came from residential background ..