Thermal overload which means it's overheating. My PD unit has three 25 amp fuses on it. The power to the fan runs thorough one of the fuses. I'm not saying the fan is the only thing that runs through the fuse but certainly the fan is one of the things that does.
The converter may be difficult to get to depending how the unit was designed. Mine is a Jayco and Jayco for some stupid reason located the converter behind the panel in my basement storage area. I have to remove about 10 screws and pull the panel down to get to the converter. Some time this winter I plan to cut an access door into the panel so I don't have to remove the entire panel.
2010 Eagle Super Lite 315RLDS
2018 GMC Sierra 3500HD 6.6L Duramax
2010 Nights 45
2011 Nights 70
2012 Nights 144
2013 Nights 46
2014 Nights 49
2015 Nights 57
2016 Nights 73
2017 Nights 40
2018 Nights 56
2019 Nights 76
2020 Nights 68
