Adam,

I got your email this morning and wanted to answer the question here in case anyone else was curious. Everything in your symptoms shows that the thermostat is working properly. Your heating device is struggling to maintain your setting of 99.0 degrees. In your email it listed the room temperature swings from 80 and drops down to 70. For some heating devices (and depending on probe placement) it may be difficult to reach your 99 degree setting with the room temp at 70. This is not a fault of the thermostat. What is happening is the thermostat is determining how much power it takes to reach and maintain your target temp. When you did the master reset you are clearing its learned power curve. This clearing also happens if you enter the menu or if the device is unplugged. The device will then slowly work its way up to the target temp. When it gets two degrees below target temp it will start figuring out a curve. Every cycle if the temp is below your setting it will bump the power up a percent. If the device overshoots the target temp then it will bump the power down a percent. In your case it had to continue bumping the power up to 100% to keep close to the target temp. Once it goes over the target it shuts power off which is designed. The object is to stay as close to target without overshooting by much. In your case this is providing regulation 98.7 to 99.1 degrees. This is excellent regulation! I wouldn't suggest changing anything unless you started seeing the temps drop too much in which case you would need to keep the room consistently warmer or upgrade the heating device to a higher wattage. Now if you had a hot room or a overpowering heating device your would see those numbers backing down and not staying at 100%. Hope that helps clear things up.

Dion Brewington
Owner, Spyder Robotics