[RE-wrenches] Battery Sensor Light on VFX3648

[Chris Schaefer]

While on the subject of VFX inverters in regards to the fan and internal
temp sensors, I've got a client with a circa 2010 VFX3624 that appears to
have a failed fan. I don't normally deal with 24 volt inverters. I've got
many dead VFX3648 units hanging out. My question is can I cannibalize a fan
out of a 48 volt unit and put it in a 24 volt unit? Next, let's say the fan
is ok and based on the readings above I should look into replacing the xfmr
temp sensor. Again, can I take one out of a 48v inverter and use it on a
24v unit? Which board might be suspect as well that the xfmr temp sensor
feeds its information too?

Thanks,
Christopher

On Thu, Jan 8, 2026 at 9:23 PM Jerry Shafer via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Wrenches, Jay,
> Transformer temp sensors in the FX Fails, fans fail causing fet boards to
> overheat, dirty filters cause high temps on all the intervals. When outback
> was still running the parts department you always got temp senders with
> fans, boards and a relocation procedure, yes you must put the sensor in a
> new location.
> FunTimes
>
> On Thu, Jan 8, 2026, 3:26 PM Jay via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> 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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-- 

Chris Schaefer’s


*Tel 585-229-2083 or Cell 585-748-1870 *
*5115 S Hill Road ~ Canandaigua New York 14424**www.solarandwindfx.com
<http://www.solarandwindfx.com> ~ E-mail: chris at solarandwindfx.com
<chris at solarandwindfx.com>*


Thomas Jefferson, the author of our great Constitution, once said,
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