It’s been a lot of years since replaced one, but from memory, the early FX had the temp sensor plugged into the board.
Later models, I don’t know when it started had the temp sensor attached to the transformer with tape but it still attaches to the same plug on the board. The replacement temp sensors attach to the transformer and include the high temp tape to attach to the transformer. it takes all of about 2 minutes to do, once you have the top taken off the inverter. Since the cost of the site visit and time to remove the inverter to replace the $20 temp sensor is high, i also replace the fan as its also inexpensive but the service call is expensive for the client I presume that Zonna has the temp sensors and maybe fans again. Jay > On Jan 9, 2026, at 4:56 PM, Jerry Shafer <[email protected]> wrote: > > Wrenches. Jay > As l recall all the fans are the same PN same with the sensors. Just relocate > the temp sender to the new location as l recall it is on top of the xfmr. > Fun times > > > On Fri, Jan 9, 2026, 3:52 PM jay via RE-wrenches > <[email protected] > <mailto:[email protected]>> wrote: >> HI Chris, >> >> They are all 12v fans and universal between 12,24,48v units >> >> jay >> >>> On Jan 9, 2026, at 4:35 PM, Chris Schaefer via RE-wrenches >>> <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> 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] >>> <mailto:[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] >>>> <mailto:[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] >>>>>> <mailto:[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] <mailto:[email protected]> >>>>>> >>>>>>> On Jan 8, 2026, at 3:00 PM, Drake Chamberlin via RE-wrenches >>>>>>> <[email protected] >>>>>>> <mailto:[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 >>>>>>> <http://re-wrenches.org/> >>>>>>> >>>>>>> List Address: [email protected] >>>>>>> <mailto:[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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