Welcome to the forum Bill and I’ll start by advising that I don’t know your coach specifics at all but maybe I can help a little. If your coach is like most, the steps are powered from the chassis battery not the coach battery. So do the steps retract at all? Normally they will retract when you start your coach......is that what you are trying to verify?
Regarding the fridge fan......I assume you have a propane/120vac fridge in your class C which typically don’t come with fans....so is this an after market fan placed “into” the fridge for improved efficiency? You said “under the fridge”........so I am wondering if this is your converter fan that is coming on when you are on shore power or when the use/store is on......the converter output then charges the batteries and that can also cause the fan to start running to keep the converter cool also.