Product review (5 stars): The -002 water sensor is a vast improvement over the original -001, but the TrueSteam has other ongoing reliability issues....
The -001 sensor has plastic on the sensor fingers that cracks causing the hot water to wick up and give false overflow readings. Honeywell obviously used a cheaper grade of plastic that could not handle the temperature of boiling water.

The -002 sensor is black instead of gray plastic and does handle the hot water properly. Be aware, however, that the middle length finger which senses a correct water level "lives" at the frontier of boiling water and the steamy environment above it. Minerals and crud in your water supply that make it through the in-line sediment filter will coat the metal "finger end" over time (less than 2 seasons of use). The -002 sensor will then NOT sense the water level properly and your water tank will overfill, tripping the red "Call Service" LED.

Never fear...

Scrape the crud off of the metal "finger end" with a small pocket knife, being careful not to nick the plastic above it. Then burnish the metal "finger end" with a Brillo pad or a green "Scotchbrite" scouring pad. Make it shiny and it will work like new. Reinstall, reassemble everything, connect power, and press the reset button.

Your TrueSteam will begin to once again work like it's supposed to do.

Now if the water tank only didn't discolor, warp a bit, and get brittle causing micorcracks and leaking from the boiling water....

(This whole design from the "Well of Honey" is a reliability nightmare, needing a lot of regular TLC. It's just the nature of the beast. )