Generally it will be right near where your power cable enters your RV. They are often behind a wall in a storage area as they are not something most users will need to deal with. We had issues with ours and found while it was unpowered we could rap on it with the but of a screw driver a few times and it would reset. I did try blowing it out of dust and that seemed to help, but finally just had it replaced.
Two Wire Fox Terriers; Sarge & Sully
2007 Winnebago Sightseer 35J
2020 Jeep Gladiator Rubicon