Have you checked the ductwork to see if you have any leaks ? Do you have a strong airflow out of the registers ?

I fixed it today so I wanted to post in case anyone else had a similar problem. I found a loose wire going from 1 of the main wires coming off the fuses to the sequencer. I replaced the terminal and the temp went up 10 degrees. I kept checking and found the ductwork that connects the other side of t...

My Coleman 3400-820 heater was producing less heat today than normal. I checked it with a thermometer at the floor duct and it was showing 92 degrees with an actual room temp of 70 degrees. The blower motor works fine and if I lower the thermostat setting the system will cycle like normal. I suspect...