Furrion AC System With E3 Error Code Still On After Replacing Thermostat and Control Box

Updated 06/25/2024 | Published 06/09/2024

Question:

I have a furrion air conditioner. The thermostat stop working and we order knew one to replace old one. It gave us E3 code. Well we also changed control box. It has been checked by hooking up thermostat to thermostat wire on AC. That didnt do anything different either. All wire have been checked to see if voltage is good. Im at a lost. This camper is something my mother in law lives in so it is hooked up to electric and has battery hooked up. Its 2021openrange light travel trailer.

asked by: Stephanie W

Expert Reply:

The E3 error code on a Furrion AC unit indicates a communication error between the thermostat and controller. The typical cause is usually a cut or short in the wiring. Since you have replaced both the thermostat and the controller you will want to try running a separate thermostat wire from the controller to the thermostat to verify this fixes the issue.

expert reply by: Bud M

Stephanie W.

6/24/2024

We have done the separate thermostat wire also. It did same thing. Are there dipswitchs in that control box.

Bud M.

6/25/2024

@StephanieW Yes, the AC control box will likely have dip switches inside of it. For a Furrion control box the first 2 switches are for the zone, 3rd is for a heat pump, 4th is for the furnace, 5th is for a heat strip and 6th is for a digital or analog thermostat.