51
SERVICING
SERVICE NUMBERS
S-1
CHECKING VOLTAGE ................................................................................................................................... 58
S-2
CHECKING WIRING ...................................................................................................................................... 58
S-3A
THERMOSTAT AND WIRING ......................................................................................................................... 59
S-3B
HEATING ANTICIPATOR ................................................................................................................................ 59
S-4
CHECKING TRANSFORMER AND CONTROL CIRCUIT ................................................................................ 59
S-16A
CHECKING AIR CIRCULATOR BLOWER MOTOR (MULTI-SPEED ECM MOTOR) ....................................... 60
S-200
CHECKING DUCT STATIC ............................................................................................................................. 60
S-201
CHECKING TEMPERATURE RISE ................................................................................................................ 60
S-300
CHECKING PRIMARY LIMIT CONTROL ........................................................................................................ 59
S-301
CHECKING AUXILIARY LIMIT CONTROL ....................................................................................................... 62
S-302
CHECKING FLAME ROLLOUT CONTROL .................................................................................................... 63
S-303
INDUCED DRAFT BLOWER MOTOR ............................................................................................................ 63
S-304
CHECKING GAS VALVE (REDUNDANT) ....................................................................................................... 63
S-305
CHECKING MAIN BURNERS ........................................................................................................................ 63
S-306
CHECKING ORIFICES ................................................................................................................................... 64
S-307
CHECKING GAS PRESSURE ....................................................................................................................... 64
S-308
CHECKING HOT SURFACE IGNITOR ........................................................................................................... 67
S-309
CHECKING FOR FLASHBACK ...................................................................................................................... 67
S-310
CHECKING PRESSURE SWITCH ................................................................................................................. 67
S-311
HIGH ALTITUDE APPLICATION (USA) ........................................................................................................... 68
S-312
CHECKING FOR DELAYED IGNITION ........................................................................................................... 68
S-313
CHECKING INTEGRATED IGNITION CONTROL BOARDS ............................................................................ 68
S-314
CHECKING FLAME SENSOR ....................................................................................................................... 69
