FIGURE 91
MODELS WITH INTEGRATED FURNACE CONTROL (IFC) UTEC 1028-927/928 OR
JOHNSON CONTROLS G961 DAJ-2401/2402 (SPARK IGNITION)
WARNING
~
HAZARDOUS VOLTAGE DISCONNECT POWER BEFORE SERVICING.
LINE VOLTAGE
SERVICE MUST BE BY A TRAINED,
CONNECTIONS QUALIFIED SERVICE TECHNICIAN.
START
1. SET FAN SWITCH TO AUTO
2. SET THERMOSTAT TO
CALL FOR HEAT
INTEGRATED FURNACE CONTROL (IFC)
TROUBLESHOOTING GUIDE
INDUCED DRAFT
MOTOR STARTS
YES
NO
• EXAMINE IFC POWER LED AND FLASH CODES FROM "OK" LED
POWER LED ON?
f----11~ • CHECK LINE VOLTAGE POWER
NO • CHECK LOW VOLTAGE TRANSFORMER
YES • CHECK IN-LINE FUSE ON TRANSFORMER
LOW VOLTAGE LINE
"OK" LEDON?
NOTE: "OK" LED WILL 1--------.-i
FLASH 1 OF 5 FAULT CODES
NO
REPLACE IFC
YES
CHECKFOR24VACFROM
"W" TO "C" ON IFC
1----NO ___ ~CHECKTHERMOSTAT
WIRING
~-----~
YES
• CHECK ALL WIRING ON IFC
• CHECK PRESSURE SWITCH, OPEN?
NO
1----.-
REPLACE VENT
PRESSURE SWITCH
YES
CHECK FOR 115 VAC AT INDUCER f------N_O
AND INDUCER OUTPUT AT IFC
__ ._ REPLACE IFC
YES
REPLACE INDUCER
30 SEC. PREPURGE
~-----Y-ES-.-------~
1---------1~
NO
IF THE PRESSURE SWITCH DOESN'T CLOSE
WITHIN 60 SEC. THE IDM WILL STOP FOR
5 MIN. AND RETRY. DOES IDM RECYCLE?
REPLACE VENT
PRESSURE SWITCH
SPARK IGNITOR ENERGIZES
YES
NO
1---------1~
• CHECK FOR BLOCKED VENT
• CHECK AIR PROVING SWITCH (CLOSED)
• CHECK WIRING TO IGNITER
NO
• CHECK FOR 115 VAC AT IGNITER
f------~~
TERMINALS AND AT IFC TERMINALS
REPLACE VENT
PRESSURE SWITCH
REPLACE IFC
IF WIRING TO
IGNITER IS OK
YES
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