[RE-wrenches] Battery Sensor Light on VFX3648

[Jay]

I’ve replaced dozens of internal temp sensors over the years. 

I learned to also replace the fan at the same time. 

Or vice versa. 

Jay

> On Jan 8, 2026, at 4:01 PM, Luke Christy via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
> 
> 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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