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What Does It Mean If My Furrion Thermostat Is Flashing LO  

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Question:

What does Lo code on thermostat mean? Ac and dc power are on to controller. Nothing works. Just a Lo code on thermostat.

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Expert Reply:

According to the owner's manual if your Replacement Premium Wall Thermostat for Furrion Chill HE RV Air Conditioner # FR33PR is flashing LO then that means you have an insufficient low-level 12V power supply.

I recommend checking your wiring and connections to the thermostat and ensure that you are in fact getting an adequate 12V with a multimeter # PT89ZR.

If you verify that you are getting 12Vand all of your wiring is good, come back and we can continue to troubleshoot deeper.

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Bryce D
Mike S. profile picture

Mike S.

4/15/2025

I have 13.5 to my thermastat and it is still flashing lo. What could it be

BryceD profile picture

Bryce D.

4/16/2025

@MikeS Hey Mike, since you're getting the correct voltage and you're still getting the error, then it sounds like there is actually something wrong with the thermostat itself, likely the temperature sensor. Your next move here should be to replace the thermostat with the Replacement Premium Wall Thermostat for Furrion Chill HE RV Air Conditioner # FR33PR. Let me know if there is anything else I can do for you, and I'd be happy to help!

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