STC says “heating” but is actually cooling

[TastyAdventure]

My STC is set for 2.5 Celsius, but my deep freezer is sitting at 10 Fahrenheit (checked with an independent manual thermometer).
The STC probe is reading it at -12 Celsius, and the light for “heating” is on, but the temperature is still holding below freezing!
It was working fine for several months up until a week ago. I didn’t change anything... help!!

 

[redllama]

Check your wiring to make sure nothing is touching, I had a similar problem after I moved with all the jostling around. A quick "touch up" and it has worked perfectly since