Gary, The way I always check, aside from looking at the control panel in the coach is with a voltmeter on the batteries.... I would be looking for 13.6 volts or better...If not then I am verifying that there is 120 volts getting to the 458.
Don't know which control panel you have but on mine for the 458's I have a LED indicator registering if there is AC in. If the green LED is not illuminated and you have 120 into the coach from shore power then I would be checking the connection inside the 458 since it does not recognize that there is 120 volts present.
I have had and I have seen two other incidences where while on shore power the inverter converter charger did not operate.. The problem in all three cases was the mechanical electrical connection bringing 120 volts into the 458 had failed... On mine and the two others the connection inside the 458 was with wire nuts which over time either loosened or corroded... The access panel on the front of the 458 will give you access to the connectors.
An another potential culprit is the BIRD (if you have one) which allows both the house and chassis batteries to be charged by the alternator... There is a control board and a solenoid that interrupts charging current from the inverter/charger if there is voltage present from the alternator...
JohnnyT
2004 40DS02 Travel Supreme ISL 400
Jeep Grand Cherokee, Ford F150
M&G Brake & Break Away
Blue Ox Aventa LX Tow bar