Rheem H2AC Installation Instructions Manual page 45

MAIN BURNER FLAME SUSTAINED
YES
INDOOR BLOWER MOTOR STARTS
AFTER 45 SECONDS
YES
SYSTEM RUNS UNTIL
CALL FOR HEAT ENDS
YES
FURNACE STARTS ON HIGH FIRE.
FURNACE SWITCHES TO LOW FIRE
AFTER 120 SECONDS WARMUP IF
THERMOSTAT IS CALLING FOR W1.
FURNACE WILL SWITCH TO HIGH
FIRE IF LOW FIRE DOES NOT SATIS-
FY THERMOSTAT DEMAND FOR HEAT
LOAD.
YES
TURN THERMOSTAT OFF
VALVE SHUTS OFF
FLAME SHUTS OFF
YES
INDUCED DRAFT MOTOR(S) STOPS
AFTER 5 SECOND POSTPURGE
YES
INDOOR BLOWER MOTOR STOPS
AFTER 90 SECONDS
YES
TROUBLESHOOTING ENDS
REPEAT PROCEDURE UNTIL TROUBLE FREE
OPERATION IS OBTAINED.
NOTE: IF THE SYSTEM GOES INTO LOCKOUT, WAIT
30 SECONDS AND RESET THE SYSTEM.
NO
• CHECK FLAME SENSOR POSITION AND CONDITION
• CLEAN FLAME SENSOR WITH STEEL WOOL
• CHECK FLAME SENSOR WIRES AND CONNECTIONS
REPLACE IGNITION CON-
• CHECK FOR 24 VAC ACROSS BLOWER
NO
MOTOR TERMINALS ON CONTROL BOARD
• CHECK FOR LINE VOLTAGE AT LOAD SIDE OF
BLOWER CONTACT.
REPLACE BLOWER
NO • CHECK FOR OPEN LIMIT
• CHECK FOR OPEN ROLL-OUT CONTROL
• CHECK FOR PROPER THERMOSTAT OPERATION
• REMOVE VALVE LEAD AT GAS VALVE
NO
IF VALVE CLOSES, RECHECK THE THERMOSTAT
AND WIRING. IF OK, THEN REPLACE VALVE
NO
TROL
YES
MOTOR
YES
REPLACE SENSOR
NO
REPLACE INTEGRATED
CONTROL BOARD (IFC)
• CHECK FOR DIRTY FILTERS
• CHECK FOR RESTRICTED
AIR-FLOW
YES
YES
CHECK FOR EXHAUST,
INTAKE OR HEAT EXCHANG-
ER BLOCKAGE
CLEAR BLOCKAGE AND
RESET CONTROL
45