[RE-wrenches] Battery Sensor Light on VFX3648

[Luke Christy]

Drake,
I agree with Ray,
The message you’re seeing does not refer to the RTS that has been absent for years- it’s an issue with an internal sensor. 
I have seen intermittent warnings relating to internal sensors on VFX units that have self-resolved with a reboot, but if the warning is persistent then you’ll likely need to open the unit up and replace the sensor. 

Luke Christy
Renewable energy consultant

NABCEP Certified PV Installation Professional™: 

Solar Gain Services, LLC
PO Box 531
Monte Vista, CO 81144
719.588.3044
sgsrenewables at gmail.com

> On Jan 8, 2026, at 3:00 PM, Drake Chamberlin via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
> 
> A couple of years back, a client changed from lead acid batteries to LiFeBlue, lithium batteries. At that time the temperature sensor was removed. 
>  
> The other day, a warning light started blinking. The warning turned out to be a bad temperature sensor. It is strange that this message showed up now, as the sensor has been gone for years.
>  
> Is there any way to turn off the warning light?
>  
> Thank you,
>  
> Drake
>  
> Drake Chamberlin
> 
> Athens Electric LLC
> 
> Ohio Electrical Contractor’s License 44810
> 
> NABCEP Certified PV Installation Professional
> 
> 
> 
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