Silver club fall service. Replaced filter. Blower motor run capacitor checked good, motor and wheel are clean, hot surface ignitor checked good, cleaned and checked flame sensor, pressure switch checked good, roll out switches (2) checked good, high limit switch checked good, inducer motor run load amps are within mfg specs, manifold pressure is 3.5 in wc, within mfg specs, checked system operation with *tstat, tstat and system operating normally. Carbon monoxide 0 ppm. Tstat is old Mercury switch type, recommend upgrade to digital.