No heat service call, service code 3 no pressure switch activation with heat call. Confirmed bad bearings locked up on 80% combustion blower assembly. Shop vac equipment, resurface flame sensor, wire brush burner tips, install new OEM combustion blower assembly Cooling system PMI, test run equipment in single stage cooling mode and confirm 52° supply temperature. PSC blower speed set to high, evaporator A coil encased in the ductwork plenum and not accessible for inspection, 3/4 PVC pipe also sealed with no service ports. Outdoor unit 50 to 75% matted over and clogged with outdoor airborne debris and mulch bed dirt. Heavy duty water flush on condenser coils, electrical compartment cleaning and inspection, replace worn out 370 VAC power supply rated at 35 + 5 UF Return thermostat to heating mode Air filter is it acceptable and on schedule with homeowners HW-16x25x4 Emerson White-Rodgers WA digital thermostat set to two-stage heat