Responded to no heat call for 12-year-old Payne PG8MAA048110 furnace displaying error code. Diagnosed failed and seized draft motor causing pressure switch fault. Inspection revealed deteriorating heat exchanger with rust at factory crimp and signs of excessive temperature stress. Blower wheel showed dust accumulation. Control board and wiring appear functional but system non-operational due to draft motor failure and heat exchanger concerns. Customer consulting home warranty company regarding repair options.