g43 service manual - Heating and Air Parts

NORMAL HEATING MODE15-SECOND COMBUSTION AIR INDUCER PREPURGEINITIATED BY CLOSED PRESSURE SWITCH.YESIGNITOR WARM-UP −− 20 SECONDS.YES4-SECOND TRIAL FOR IGNITION. GAS VAVLE OPENS.IGNITOR ENERGIZED FOR UP TO 4 SECONDS.YESFLAME STABILIZATION PERIOD.4 SECONDSFLAME RECTIFICATION CURRENT CHECK. CAN FLAME BEPROVEN WITHIN 4 SECONDS AFTER GAS VALVE OPENS?FLAME SIGNAL 0.15 microampsYESFLAME PRESENT?YESFLAME SIGNAL0.18 MICROAMPS OR GREATERYESINDOOR BLOWER ON DELAY BEGINS(45 seconds.)YESPRIMARY AND SECONDARY LIMITSWITCHES CLOSED?YESHEATING SEQUENCE CONTINUEDSureLight Control Board 32M88NOYESNONONONOABNORMAL HEATING MODEIS VOLTAGE ABOVE 75 VOLTS?YESIS THERE A PROPER GROUND?YESIS IGNITOR INTACT AND CONNECTED?GAS VALVE OFF. COMBUSTION AIR INDUCER ON.INDOOR BLOWER OFF.HAS CONTROL FAILED TO SENSE FLAME FORFIVE CONSECUTIVE TRIES DURING A SINGLEHEAT DEMAND?WATCHGUARD MODE. GAS VALVE OFF.COMBUSTION AIR INDUCER OFF.INDOOR BLOWER OFF WITH DELAYLEDs SIGNAL WATCHGUARD FAILURE CODE.IS 60-MINUTE RESET PERIOD COMPLETE?HAS CONTROL RESET IGNITIONSEQUENCE FOUR TIMES?LOW FLAME SIGNAL(Does not affect operation of control)LED #1 −− SLOW FLASHLED #2 −− FAST FLASHGAS VALVE DE−ENERGIZED.COMBUSTION AIR INDUCER DE−ENERGIZED.INDOOR BLOWER ON UNTIL SWITCH CLOSES.LED #1 −− SLOW FLASH. LED #2 −− ON.IS LIMIT SWITCH CLOSED?YESHAS PRIMARY SECONDARYLIMIT RESET (CLOSED)WITHIN 3 MINUTES?NONONOLEDS SIGNALALTERNATINGFAST FLASHYESNOYESNOYESLIMIT SWITCHWATCHGUARDMODE. GAS VALVEOFF. COMB. AIRINDUCER OFF.INDOOR BLOWEROFF WITH DELAY.LED#1−SLOWFLASH LED#2− ON.IS 60−MINUTERESET PERIODCOMPLETE?NOYESROLLOUT SWITCH CLOSED?YESCOMBUSTION AIR PRESSURESWITCH CLOSED?YESTHERMOSTAT DEMAND SATISFIED.YESLED #1 & #2 SIMULTANEOUS SLOW FLASHES.YESCOMB. AIR INDUCER CONTINUES 5-SECONDPOST PURGE AFTER T’STAT DEMAND IS SATISFIED.INDOOR AIR BLOWER COMPLETES SELECTEDOFF" DELAY BEFORE SHUTTING OFF.NONOGAS VALVE POWER OFF.COMBUSTION AIR INDUCER POWER ON.INDOOR BLOWER ONLED #1 −− ON. LED #2 −− SLOW FLASH.SEQUENCE HOLDS UNTIL ROLLOUT SWITCH IS RESETAND MAIN POWER IS INTERUPTED ORTHERMOSTAT IS CYCLED OFF/ON FOR 1 TO 20 SEC.GAS VALVE DE−ENERGIZED.COMBUSTION AIR INDUCER ON.INDOOR BLOWER OFF WITH DELAYLED #1 −− OFF. LED #2 −− SLOW FLASH.HAS CAB SWITCH CLOSED IN 2.5 MINUTES?NO5-MINUTE PRESSURE SWITCHWATCHGUARD MODE.YESPage 42