Unresolved Extruder shutting down at 234

Sorry if this question has been asked already, a few cursory search got no results and I'm feeling frustrated. I am trying to get my printer set up to run abs and it keeps shutting down at 235, I need to go higher as the extruder is not flowing at all and it balls up the filiment at the feed wheels. I know there is a way to increase the max allowed temp I just don't know how to do it. I'm using a first gen R1 with Repetiere. Thanks in advance