Let me clarify. The top, larger reading of actual water temperature was reading in Centigrade, while the limit setting, controlled by the thumbwheel was being set in Fahrenheit.So when you set the bath temp to any typical setting above 100 degree F, the circulator is looking for that number, but in degrees C, it will never reach it since the water can never go above boiling - it can never go to 100+ degrees C.
Anova Customer Service gave me some troubleshooting to try:
Thorough cleaning - Hard water stains will appear on the heater and stainless steel skirt, causing the unit to malfunction, show system error or sometimes the sensors are unable to generate heat. You can use any of the ff: (1) ZEPCalcium Lime Rust Remover. (2) Lime-Away (3) Vinegar (4) Barkeeper's friend
Reset Error - I personally tried to do this quite a dozen times, and it's really effective! Try turning on and start the Anova machine when it is out of the water bath, it will, of course, force an error to alarm. This will somehow reset the error.
Give it a rest - If the above suggestions failed, please give the device a complete drying and resting (24 hours). If you want, you can put the unit in your rice bin, so that any moisture that the unit absorbed in the past usage will be completely dried.
None of these suggestions solved the problem and the unit continued in this mismatched mode.
They replaced my unit under warranty.