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Troubleshooting An E3 Error Code With A Furrion RV Air Conditioner System  


Our 2023 Forest river 234DC travel trailers ac wall mount flashes E3. How do we fix it


Expert Reply:

An E3 error code on a Furrion AC system means you have a communication error between the controller and thermostat. This is typically caused by the A and B wires being flipped from the factory. With your trailer being so new this could be the cause unless you've been using it without issue for awhile. If the A and B wires are correct and there's no loose connections then the next thing to check would be the voltage to the thermostat.

You can test the power wire to the thermostat with a multimeter # PT89ZR to see if it's actually getting a full 12 volts to fully power the thermostat. If not then you'll need to trace the wire and look for damage that could be causing a short. If the wiring isn't the problem then you'll need to replace the thermostat with either the single-zone # FR33PR or multi-zone # FR93PR.

expert reply by:
Kevin C

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