Firefly VegaTouch Thermostat issues

[MeSteve]

I thought I'd throw this out there to see what others are seeing. We've had our Challenger 37KT for a couple of years, but the front temp sensor has always been "off". Now that were spending time in the cold, its reading 54* when a more reliable digital thermostat is reading 68*. This is obviously a problem when trying to set up our thermostat to kick on the heat at night when the temps dip down to freezing.

I contacted Firefly and they sold me a new temp sensor, but ohms readings across the new one and old one foreshadowed the results once hooked up, no change.

Has anyone run across this type of issue and what was the fix if so?

Thanks.