Removed and cleaned and reinstalled flame sensor Removed and cleaned and reinstalled gas burners Checked gas outlet pressure Checked igniter Checked filter Inspected and tested inducer motor and blower motor Checked your condensate drain trap Furnace has issues that need immediate attention Inducer not covered by C&t warranty Flame sensor rusted out on stem and has the potential to break- shutting down heat Gas burners had excessive rust and some blockages in bleed through veins, preventing flame bleed through - shutting down heat Inducer motor on start up 2.3amp and running was 1.5amp. Max amp is 1.35amp - shutting down heat Primary heat exchanger heavily rusted out on all 4 chambers but especially the 1st chamber - carbon monoxide leak potential in future Recommend second opinion with Dan Fox parts v replacement