Rheem RGPH Installation Instructions Manual page 37

FIGURE 33
INTEGRATED FURNACE CONTROL (IFC) TROUBLESHOOTING GUIDE
FOR UTEC 1012-920 & HONEYWELL S9201E2001 (115 VAC IGNITER)
START
1. SET FAN SWITCH TO AUTO
2. SET THERMOSTAT TO
CALL FOR HEAT
INDUCED DRAFT MOTOR
(IDM) STARTS
30 SEC. PREPURGE
IGNITER WARMS UP
AND GLOWS RED
34 SECONDS WARMUP
MAIN BURNER
LIGHTS
WARNING
HAZARDOUS VOLTAGE
LINE VOLTAGE
CONNECTIONS
NO
• REMOVE (IFC) COVER, CHECK LIGHTS
POWER LED ON
YES
MICROPROCESSOR STATUS LED ON
NOTE: "OK" LED WILL FLASH TO
INDICATE TWINNING CIRCUIT FAULTS.
CHECK FOR 24 VAC FROM
TERMINAL "W" TO "C" ON IFC
• CHECK LIMITS, (CLOSED)
• CHECK WIRING
• CHECK PRESSURE SWITCH, (OPEN)
IF THE PRESSURE SWITCH DOESN'T
NO
CLOSE WITHIN 60 SEC. THE IDM WILL
STOP FOR 5 MIN. AND RETRY
YES
• CHECK FOR 115VAC TO IDM MOTOR
REPLACE IDM MOTOR
NO
• CHECK FOR BLOCKED VENT
• CHECK AIR PROVING SWITCH (CLOSED)
• CHECK WIRING TO IGNITER
• CHECK FOR 115 VAC AT IGNITER,
YES
TERMINALS AND AT (IFC) TERMINALS
REPLACE IGNITER
NO
SYSTEM WILL ATTEMPT TO LIGHT 4 TIMES. VOLTAGE IS PRESENT
AT THE VALVE FOR ONLY 9 SECONDS DURING EACH TRIAL FOR
IGNITION (SYSTEM WILL GO INTO A 1-HOUR LOCKOUT AFTER
YES 4 TRIES). THE BLOWER AND INDUCED DRAFT BLOWER WILL RUN
180 SEC. IF THE FIRST IGNITION TRIAL FAILS TO SENSE FLAME
• CHECK FOR 24 VAC ACROSS THE VALVE AND
VALVE TERMINALS ON THE (IFC)
• CHECK IGNITER POSITION
• CHECK FOR GAS FLOW TO AND FROM VALVE
REPLACE VALVE
FLOW CHART CONTINUED ON NEXT PAGE
DISCONNECT POWER BEFORE
SERVICING.
SERVICE MUST BE BY A TRAINED,
QUALIFIED SERVICE TECHNICIAN.
• CHECK LINE VOLTAGE POWER
• CHECK LOW VOLTAGE TRANSFORMER
NO
YES
YES
YES
YES
NO
NO
REPLACE (IFC)
NO
CHECK THERMOSTAT
WIRING
NO
REPLACE SWITCH
NO
REPLACE (IFC)
IF WIRING TO
IDM MOTOR IS OK
NO
REPLACE SWITCH
REPLACE (IFC)
NO
IF WIRING TO
IGNITER IS OK
NO
REPLACE (IFC)
IF WIRING TO
VALVE IS OK
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