I have an approx 20-year old Tempstar (model # NUGK125DK08, manufactured by 'Inter-City Products') 90% eff gas-fired furnace. Yesterday morning we noticed it was blowing only cold air. I opened it up and noticed a faint burning smell and poked around and noticed the inducer motor was hot and was not running when the furnace was switched on. I got the part today and replaced the inducer unit, which is running fine now when the furnace is switched on, but there is no ignition. What to check next?
Edit: @Mazura was right - it was the pressure switch. Note- in my previous comments, I mistakenly thought the heat switch mounted right on the inducer assembly housing was a pressure switch.