I just read your description of the furnace. Should have done that first. The important green light is constant. The Air Blend light is flashing red constantly. I have turned the power back on and turned off the Air Blend alarm. How do I determine why the Air Blend alarm is going off and how to fix ...

I have a Coleman DGAA077BDTA 77,000 BTU heater air conditioner. The Deluxe Blend Air II 7681-8171/b is sounding an alarm. The red light is flashing continuously. I can switch off the alarm and the heater appears to work fine...BUT I don't know what is wrong. The warning codes indicates that I have r...