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NOTE: IF THE SYSTEM GOES INTO LOCKOUT, WAIT
30 SECONDS AND RESET THE SYSTEM.
• CHECK FLAME SENSOR POSITION AND CONDITION
• CLEAN FLAME SENSOR WITH STEEL WOOL
• CHECK FLAME SENSOR WIRES AND CONNECTIONS
• CHECK FOR 208-230 VAC ACROSS BLOWER
MOTOR TERMINALS ON CONTROL BOARD
• CHECK CAPACITOR
YES
YES
NO
MAIN BURNER FLAME SUSTAINED
YES
NO
INDOOR BLOWER MOTOR STARTS
AFTER 30 SECONDS
REPLACE SENSOR
NO
REPLACE INTEGRATED
CONTROL BOARD (IFC)
NO
REPLACE INTEGRATED
CONTROL BOARD (IFC)
NO
REPLACE IGNITION CON-
TROL
YES
YES
REPLACE BLOWER
MOTOR
• CHECK FOR OPEN LIMIT
• CHECK FOR OPEN ROLL-OUT CONTROL
• CHECK FOR PROPER THERMOSTAT OPERATION
• REMOVE VALVE LEAD AT GAS VALVE
IF VALVE CLOSES, RECHECK THE THERMOSTAT
AND WIRING. IF OK, THEN REPLACE VALVE
• CHECK FOR OPEN LIMIT OR ROLL-OUT CONTROL
YES
NO
SYSTEM RUNS UNTIL
CALL FOR HEAT ENDS
• CHECK FOR EXHAUST OR INTAKE BLOCKAGE.
CLEAR BLOCKAGE AND RESET CONTROL
• CHECK FOR DIRTY FILTERS
• CHECK FOR RESTRICTED AIRFLOW
TROUBLESHOOTING ENDS
REPEAT PROCEDURE UNTIL TROUBLE FREE
OPERATION IS OBTAINED.
YES
NO
TURN THERMOSTAT OFF
VALVE SHUTS OFF
FLAME SHUTS OFF
YES
NO
INDUCED DRAFT MOTOR STOPS
AFTER 5 SECOND POSTPURGE
YES
YES
• CHECK FOR DIRTY FILTERS
• CHECK FOR RESTRICTED
AIR-FLOW
CHECK FOR EXHAUST,
INTAKE OR HEAT EXCHANG-
ER BLOCKAGE
CLEAR BLOCKAGE AND
RESET CONTROL
YES
NO
INDOOR BLOWER MOTOR STOPS
AFTER 90 SECONDS
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