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START
TURN THERMOSTAT
TO CALL FOR HEAT
L
DOES S69/S890 GET
POWER (24 VAC NOMINAL)?
1
YES
MAIN BURNER
LIGHTS
^
YES
MAIN BURNER REMAINS
POWERED AND LIT
YES
SYSTEM RUNS UNTIL
CALL FOR HEAT ENDS
YES
CAU. FOR HEAT ENDS:
SYSTEM SHUTS OFF
I
TROUBLESHOOTING
ENDS
FIG. 13—S89, S890 TROUBLESHOOTING SEQUENCE.
NOTE:
BEFORE TROUBLESHOOTING, FAMILIARIZE YOURSELF WITH
START-UP AND CHECKOUT PROCEDURE.
CHECK UNE VOLTAGE POWER.
CHECK LOW VOLTAGE TRANSFORMER.
CHECK LIMIT CONTROLLER.
CHECK AIR PROVING SWITCH (IF USED).
CHECK THERMOSTAT.
CHECK WIRING.
CHECK FOR 24 VAC ACROSS VALVE TERMINALS ON S89/S890 DURING TRIAL
FOR IGNITION TIMING. IF NO VOLTAGE, REPLACE S89/S890.
CHECK IGNITER POSITION.
CHECK ELECTRICAL CONNECTIONS BETWEEN S89/S890 AND GAS CONTROL
IF OKAY, REPLACE GAS CONTROL
NO
NOTE: IF S89/S890 GOES INTO LOCKOUT, RESET SYSTEM.
CHECK CONTINUITY OF GROUND WIRE.
MAKE SURE L1 AND L2 ARE NOT REVERSED; THIS WOULD PREVENT FLAME
DETECTION.
CHECK THAT BURNER FLAME COVERS IGNITER/SENSOR OR SENSOR.
CHECK INSULATION ON IGNITER/SENSOR LEADS (C. G AND J MOOELS).
CHECK INSULATION ON SENSOR LEADS AND CHECK SENSOR POSITION (D
AND H MODELS).
IF CHECKS ARE OKAY, REPLACE S69/S890 MODULE.
NO
NOTE: IF S89/S890 GOES INTO LOCKOUT, RESET SYSTEM.
CHECK CONTINUITY OF GROUND WIRE.
NOTE: IF GROUND IS POOR OR ERATIC, SHUTDOWNS MAY OCCUR
OCCASIONALLY EVEN THOUGH OPERATION IS NORMAL AT THE TIME OF
CHECKOUT.
CHECK FOR EXCESSIVE HEAT AT IGNITER CERAMIC BASE (TEMPERATURE
ABOVE 1000* F [538е С] CAUSES SHORTS TO GROUND).
IF CHECKS ARE OKAY, REPLACE S89/S890 MODULE.
CHECK FOR PROPER TEMPERATURE CONTROLLER OPERATION.
REMOVE VALVE LEAD AT S89/S890; IF VALVE CLOSES. RECHECK
TEMPERATURE CONTROLLER AND WIRING; IF NOT. REPLACE GAS
CONTROL
REPEAT PROCEDURE UNTIL TROUBLEFREE OPERATION IS OBTAINED.
15
68
0070— 1
-
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