y
FIGURE 99
MODELS WITH INTEGRATED FURNACE CONTROL (IFC) UTEC 1028-927, -928 OR
JOHNSON CONTROLS G961DAJ-2401, ·2402
(SPARK IGNITION)
WARNING
'-Ill.
<11
-
HAZARDOUS VOLTAGE DISCONNECT POWER BEFORE SERVICING.
LINE VOLTAGE
SERVICE MUST BE BY A TRAINED,
CONNECTIONS
QUALIFIED SERVICE TECHNICIAN.
START
INTEGRATED FURNACE CONTROL (IFC)
1. SET FAN SWITCH TO AUTO
2. SETTHERMOSTATTO
TROUBLESHOOTING GUIDE
CALL FOR HEAT
NO
INDUCED DRAFT
t------- • EXAMINE IFC POWER LEO AND FLASH CODES FROM "OK" LED
MOTOR STARTS
POWER LED ON?
1----11..i • CHECK LINE VOLTAGE POWER
YES
NO • CHECK LOW VOLTAGE TRANSFORMER
YES • CHECK IN-LINE FUSE ON TRANSFORMER
LOW VOLTAGE LINE
"OK" LED ON? NO
NOTE: "OK" LED WILL
t---------1~ REPLACE IFC
FLASH 1 OF 5 FAULT CODES
YES
CHECK FOR 24 VAC FROM
I-- __ N_0__ --111-lCHECK THERMOSTAT
"W" TO "C" ON IFC WIRING
~-----~
YES
• CHECK ALL WIRING ON IFC NO REPLACE VENT
,
• CHECK PRESSURE SWITCH, OPEN? 1------1~ PRESSURE SWITCH
YES
CHECK FOR
115VAC AT INDUCER t----N0----11..i REPLACE IFC
AND INDUCER OUTPUT AT IFC
YES
REPLACE INDUCER
IF THE PRESSURE SWITCH DOESN'T CLOSE REPLACE VENT
30 SEC. PREPURGE t------- WITHIN60 SEC. THE IDM WILL STOP FOR PRESSURE SWITCH
~----Y-E-S------~ NO 5
MIN. AND RETRY. DOES IDM RECYCLE?
REPLACE VENT
NO • CHECK FOR BLOCKED VENT
PRESSURE SWITCH
SPARK IGNITOR ENERGIZES
1------...-..i • CHECK AIR PROVING SWITCH (CLOSED)
(OR)
• CHECK WIRING TO IGNITER NO REPLACE IFC
HSI WARM-UP
• CHECK FOR
115 VAC AT IGNITER 1--------'ll...i IF WIRING TO
YES
TERMINALS ANO AT IFC TERMINALS IGNITER IS OK
YES
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