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 < [email protected]> 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 < > [email protected]> 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 < >> [email protected]> 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 >> [email protected] >> >> On Jan 8, 2026, at 3:00 PM, Drake Chamberlin via RE-wrenches < >> [email protected]> 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* >> >> >> -- >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. 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When one doesn't work, try the >> other: >> https://www.mail-archive.com/[email protected]/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. 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