Product review (5 stars): Easy to replace.  Saved HUNDREDS of $$ vs. calling a "pro".
Perfect replacement.  Fixes my 6-blink red led problem for about 1/4th what it would cost to get an HVAC guy to even come open up the TrueSteam.  It fixed the problem immediately & has been working fine for about a month now.  I expect it will fail in a year or so, but that's the nature of the beast here.  Really glad to know it can be fixed easily for ~$60.

If you are hesitant about if you can replace it, you shouldn't be.  The item comes with instructions how to replace the sensor.  Basically 4 steps:
1) UNPLUG the Truesteam from the AC outlet!
2) unscrew the 1 screw on the front to open the top.
3) unscrew 2 screws on the water level sensor & remove the u-shaped tension bar.
4) disconnect, remove & replace the water level sensor.
Reassemble by reversing steps 1 -3.

I uploaded some pictures of the sensor I removed so you can compare yours if you would like before buying a new one.  The cracks in the plastic are the problem, and the general warping of the sensor is a sign of the heat stress that causes these things to fail.