If I remember right several people were saying that they had heaters that would run but then start to turn on and off and on and off.
I was have this trouble with my unit a 2000 Winnebago Adventurer 35U after a few phone calls and head rubbing it was found that the blower was bad and not moving air to cool heater so it would shut down and start but still to hot shut down and start again.
fix remove blower motor and replace I have not recived my unit back from dealer yet but will let all of you know if this works so if you are having the same trouble it might same you some time and money.
2000 Winnebago Adventurer 35U
Mark & Joanne Bento