Hi - I'm new to the forum and excited to have a source of information and help. I have two Quadrafire pellet inserts and while they have not been without issues overall I'm satisfied. I have a Mt. Vernon AE and a Santa Fe. My current issue is with my Mt. Vernon. I'll set the thermostat at 75 degrees and it will consistently shutdown at 68 degrees. Is there a setting that I'm missing. The "Temperature Differential" and "Temperature Calibration" seem like they me help but I don't see any information in the manual for these. Any help would be appreciated.