Hi folks, my first post here. This is our first winter in this house. The unit was installed in July 2012 but a company that doesn't do much with geos, but the previous owner really wanted air conditioning and didn't want to wait. During this recent cold snap we have had, the unit has had trouble heating the house comfortably. For instance it simply can't get above 61 or so inside when it gets below 0 outside. We set it at 65...because I am cheap...and it just runs, so I have been setting it lower and lower. I've done a little research and have the manual for the unit. My opinion is that the aux heat will not come on, even when the thermostat is calling for it. There's a control board in the geo with LEDs. Even if the thermostat calls for aux, the aux LED does not light up, and the air temp coming out of the vents does not increase. Y1 and Y2 light up when the unit comes on, and the fan is putting out plenty of air (there's a blinking LED that indicated 1700 cfm). Even with Y1 and Y2 on, it's not maintaining a comfortable temperature, but that could be because it's been sub zero, even for the high, over the last week. So - what I want to do, but can't figure out how to, is test the aux heat strips directly to see if they'll come on (if that's the the right thing to do). The t-stat seems to be wired correctly. I have pics of the board and wiring that I can upload if it's helpful. Don't know if it's even possible to trouble-shoot this way; the manual is not much help in this regard. I was hoping there would be a "functions test" or something I could run. One thing I should have done was test the EM heat. Will do that later.