Troubleshooting An E3 Error Code On A Furrion Air Conditioning System

Question:

I have a 2023 Cherokee by forest river model 324TS. Furrion thermostat Control box Have had two service calls and still not working We tried switching the A B wires- didn’t work Connected thermostat directly to control box - worked for two days and is flashing E3 again. The dealership can not come out until January 4th It’s going to be below freezing the next couple of nights What do you recommend our next step to be

asked by: Cynthia J

Expert Reply:

An E3 error code means there's a communication error between the zone controller and the thermostat. Since you've already tried connecting the wires from the thermostat directly to the zone controller (great idea btw) and still are having issues, even with the A and B wires flipped, that would mean the issue is with either the thermostat or the zone controller.

Since these aren't items that can be taken apart and fixed you'd need to replace them. I recommend starting with the thermostat # FR33PR since these are the cheaper item to replace and are typically the item to fail when it comes to any AC system. If a new thermostat doesn't fix the issue then the controller will need to be replaced with part # FR43PR.

expert reply by: Kevin C