Performed fall system check on 2 20+yr old carrier units, started with upstairs unit first, customer was asking about replacing upstairs tstat, gave estimate to replace upstairs tstat, cycled tstat to heat mode, unit started up, went in attic , inspected unit, found gas line sediment trap is installed incorrectly, recommend correcting gas line, no te flood protection, recommend wet switch to prevent water/ceiling damage, cleaned flame sensor, igniter has signs of white, recommend replacing igniter, explained it can fail at any moment, inducer making loud noise as if barring are failing, pulling high amps, recommend replacing inducer motor, blower check ok, capacitor checked ok, flushed drain line, no gas or co detected, explained to customer due to age and condition highly recommend install supervisor , next started on main floor unit, checked tstat, cycled to heat mode, went in basement and inspected furnace, found no flood protection, recommend ss1 switch, customer declined, cleaned