YES
REPLACE BLOWER MOTOR
I
SYSTEM RUNS
NOTE: IF IFC GOES INTO LOCKOUT
WAIT 30 SECONDS THEN
UNTIL CALL FOR
-
RESET SYSTEM
HEAT ENDS
I
I
I
NO
• CHECK CONTINUITY OF GROUND
WIRE. NOTE: IF GROUND IS
YES
POOR OR ERRATIC, SHUTDOWN
MAY OCCUR OCCASIONALLY EVEN
THOUGH OPERATION IS NORMAL AT THE TIME OF CHECKOUT.
• CHECK FLAME SENSE CURRENT
• CHECK FOR EXCESSIVE HEAT AT IGNITER BASE.
• TURN POWER OFF TO UNIT.
• CLEAN FLAME SENSOR WITH STEEL WOOL.
,~
• RESTORE POWER TO UNIT.
• IF CHECKS ARE OK, REPLACE IFC
TURN THERMOSTAT TO OFF
I
NO
• CHECK FOR PROPER THERMOSTAT OPERATION.
VALVE SHUTS OFF
-
-
• REMOVE VALVE LEAD AT IFC
FLAME GOES OUT
I I
IF VALVE CLOSED, RECHECK THERMOSTAT ANO
WIRING. IF NOT, REPLACE VALVE.
fYES
• CHECK FOR OPEN LIMIT. I
I
DRAFT MOTOR STOPS AFTER 5 sec.
NO
-
-
REPLACEIFC
,Yes
J
MAIN BURNER
LIGHTS
YES
I
,,
MAIN BURNER
'
REMAINS POWERED
-
RESET SYSTEM
AND LIT
I I
• CHECK POLARITY OF 115 VAC SUPPLY
YES
• CHECK CONTINUITY OF GROUND WIRE
• CHECK INSULATION ON IGNITER
• CHECK FLAME SENSE CURRENT (YELLOW LED)
LED IS ON IF FLAME CURRENT IS GOOD,
IT FLASHES IF CURRENT IS MARGINAL.
• TURN POWER OFF TO UNIT
• CLEAN FLAME SENSOR WITH STEEL WOOL IF LED FLASHES
• RESTORE POWER TO UNIT
It
• IF CHECKS ARE OK, REPLACE IFC
INDOOR BLOWER MOTOR
• CHECK FOR 115 VAC ACROSS BLOWER
~
REPLACE IFC IF
STARTS 20 SECONDS
-
I
I
I
NO
MOTOR ANO BLOWER MOTOR TERMINALS NO WIRING TO BLOWER
AFTER MAIN GAS VALVE OPENS
(HEAT ANO NEUTRAL) ON IFC MOTOR IS OK
INDOOR BLOWER MOTOR
I
NO
STOPS AFTER
90/120/160/180 SECONDS
I I
YES
I
TROUBLESHOOTING ENDS
I
NOTE:
REPLACE IGNITER
I
SYSTEM WILL ATTEMPT TO LIGHT 4 TIMES.
VOLTAGE IS PRESENT AT THE VALVE FOR
ONLY 8 SECONDS DURING EACH TRIAL FOR
MAKE SURE DRAIN
NO_
PRESSURE SWITCH
IGNITION (SYSTEM WILL GO INTO A 1•HOUR
NO
I
BETWEEN IFC AND
LOCKOUT AFTER 4 TRIES). THE BLOWER AND
GAS VALVE IS CLOSED
IGNmON TRIAL FAILS TO SENSE FLAME.
I
-
IDM WILL RUN 180 SEC. IF THE SECOND
YES
.NO
• CHECK FOR 24 VAC ACROSS THE VALVE
ANO VALVE TERMINALS ON THE IFC
REPLACE DRAIN
f YES
PRESSURE SWITCH
• CHECK IGNITER POSITION.
• CHECK FOR GAS FLOW TO AND FROM VALVE.
tNO
REPLACE IFC IF
REPLACE VALVE IF NO
I
WIRING TO VALVE IS OK
FLOW THRU VALVE
NOTE: IF (IFC) GOES INTO LOCKOUT WAIT 30 SECONDS THEN
I
NO
+YES
- • CHECK FOR OPEN LIMIT. ,
REPLACEIFC
REPEAT PROCEDURE UNTIL TROUBLEFREE
OPERATION IS
OBTAINED.
STATIC DISCHARGE CAN DAMAGE INTEGRATED FURNACE CONTROL (IFC)
• "OK" LED BLINKS TO INDICATE EXTERNAL FAULTS:
(1) BLINK FOLLOWED BY A 2 SEC. PAUSE - 1 HOUR LOCKOUT
(2) BUNKS FOLLOWED
BY A 2 SEC. PAUSE - PRESSURE SWITCH IS OPEN
(3) BLINKS FOLLOWED BY A 2 SEC. PAUSE - LIMIT SWITCH IS OPEN
(4) BLINKS FOLLOWED BY A 2 SEC. PAUSE - PRESSURE SWITCH CLOSED
(5) TWINNING FAULT
92•22744-12·03
83
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