i have a 48tme012 and the only way that I get the heating call to work is to turn the IDF to on,then eveything will run IDF and burners come on and will cycle on the therm for temp. If fan left in auto the unit will not do anything. I disconected the therm wires at unit and jumped out r-w1 no action but r-w1 and g unit starts. The ignitor module and limin switch were replaced July,2012