On my 98 Eagle, the patio receptacle breaker is the one for the block heater, so I recommend that you call American Coach....they will be extraordinarily helpful in determining if there is anything else for you to check.
If your breaker is the same as mine, it may be that the block heater just is not functioning for some reason.
Good morning and I'm hopeful you may be able to guide me to an answer. I have a 97 American dream and I am having a really tough time turning on the block heater. I have the block heater plugged in, but I hear there is a switch somewhere that will activate the block heater. The patio receptacle breaker and all breakers are turned on but it is this mysterious switch that I am unable to fine. Any direction you may be able to provide, I would be very grateful. Thanks, Brian