Star,I had 4 Aux's at one point.They were an in unending problem and they cost me so much money it was a joke.
I was able to cut a deal with Alumi Junk for a trade in deal for ProHeats.Alumi is the responsible party for AUX generators,and they may help you as they did me.
So glad to see the end of that nightmare.The ProHeats have also had problems with retrofits etc.,but they are good people and support their product. Good luck.