Howdy, I'm brand new to pellet land. 2 weeks! I picked up a used Mt Vernon AE Insert, MFR-2008 and I have a question about how the wall control works. The Thermostat reads about 9 degrees F hotter that the room really is. I have two other thermostats right next to it that are 0.5 degrees apart and the AE control says 79.0 while the others read 70.0 & 70.5. The thermostat is away from the insert and away from the convection flow. I can't seem to figure out how the temp calibration works. I pressed the - button till it read -9 and expected my display to read 9 degrees cooler. It did not seem to have much effect. Does anyone here have any experience with this function? Thanks!