Power problem for fridge and AC

So how deep is your knowledge of RV electrical systems? There are two, a 12V system and a 120V system. The 120V system won’t work if the RV cord isn’t plugged in to a 120V outlet; in which case the air conditioner, microwave, power outlets in the trailer, possibly the refrigerator (depending on how it’s configured), the converter, etc. all won’t work.
If the 12V system doesn’t have a charged 12V battery hooked up, the 12V system won’t work either (depending on the status of the 120V system). Hence, it is hard for us to help you because we don’t know how deep your knowledge is and what is functioning and what isn’t. One sentence that basically says “it doesn’t work” doesn’t cut it.
Is the RV plugged in?

Does the pedestal have power?

Is there a functioning battery installed?

The questions are endless, we need more info.

P.S. The fridge and AC (assuming you mean air conditioner) are 120V, their power sorurce will be protected by circuit breakers, not fuses.