Honeywell S8600B - Troubleshooting Guide

15
69-1954—01
S8600B,C,H,M; S8610B,C,H,M; S8670D,E,J,K INTERMITTENT PILOT GAS IGNITION CONTROL
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POWER TO
MODULE? (24 V
NOMINAL)
SPARK
ACROSS IGNITER/
SENSOR
GAP?
NO
MAIN BURNER
LIGHTS?
“CALL FOR HEAT” ENDS
SYSTEM
SHUTS
OFF?
NO
REPEAT PROCEDURE UNTIL
TROUBLE FREE OPERATION
IS OBTAINED.
SPARK OK?
YES
PULL IGNITION LEAD AND
CHECK SPARK AT MODULE.
Troubleshooting Guide
Refer to the following guide for troubleshooting (Fig. 14).
NOTE: “CALL FOR HEAT” 24 VAC SUPPLY IS CONNECTED TO THE 24 V TERMINAL ON THE CONTROL.
NO
YES
30 SECOND
PREPURGE
NO
DELAY?(S8670
ONLY)
YES
NO
YES
YES
SPARK
STOPS WHEN
PILOT IS
NO
LIT?
YES
NO
YES
SYSTEM
RUNS UNTIL “CALL
NO
FOR HEAT”
ENDS?
YES
YES
Fig. 14. Troubleshooting Guide.
M29921
TURN GAS SUPPLY OFF.
TURN THERMOSTAT
(CONTROLLER)TO “CALL
FOR HEAT.”
PILOT BURNER
LIGHTS?
NO
TURN GAS SUPPLY ON AND
RECYCLE “CALL FOR HEAT.”
CHECK FOR PROPER THERMOSTAT (CONTROLLER) OPERATION.
REMOVE MV LEAD AT MODULE. IF VALVE CLOSES, RECHECK TEMPERATURE CONTROLLER AND WIRING. IF NOT, REPLACE
GAS CONTROL.
START
BEFORE TROUBLESHOOTING,
FAMILIARIZE YOURSELF WITH THE
STARTUP AND CHECKOUT
PROCEDURES.
CHECK LINE VOLTAGE POWER, LOW VOLTAGE TRANSFORMER, LIMIT CONTROLLER, THERMOSTAT (CONTROLLER), AND WIRING. ALSO,
CHECK AIR PROVING SWITCH ON COMBUSTION AIR BLOWER SYSTEM (IF USED) AND THAT THE VENT DAMPER END SWITCH (IF USED) IS
MADE.
REPLACE S8670
REPLACE MODULE
CHECK IGNITION CABLE, GROUND WIRING, CERAMIC INSULATOR, AND SPARK GAP AND CORRECT.
CHECK BOOT OF THE IGNITION CABLE FOR SIGNS OF MELTING OR BUCKLING. TAKE PROTECTIVE ACTION TO SHIELD CABLE
AND BOOT FROM EXCESSIVE TEMPERATURES.
CHECK THAT ALL MANUAL GAS VALVES ARE OPEN, SUPPLY TUBING AND PRESSURES ARE GOOD, AND PILOT BURNER
ORIFICE IS NOT BLOCKED (PILOT GAS FLOWING).
CHECK ELECTRICAL CONNECTIONS BETWEEN MODULE AND PILOT OPERATOR ON GAS CONTROL.
CHECK FOR 24 VAC ACROSS PV-MV/PV TERMINALS ON MODULE. IF VOLTAGE IS OKAY, REPLACE GAS CONTROL. IF NOT,
REPLACE MODULE.
NOTE: IT MAY BE NECESSARY TO RECYCLE THE “CALL FOR HEAT” MORE THAN ONCE TO CLEAR THE PILOT SUPPLY TUBES OF AIR.
NOTE: IF CONTROL GOES INTO LOCKOUT OR RETRY DELAY, RESET THE “CALL FOR HEAT.”
CHECK CONTINUITY OF IGNITION CABLE AND GROUND WIRE.
CLEAN FLAME ROD.
CHECK ELECTRICAL CONNECTIONS BETWEEN FLAME ROD AND MODULE.
CHECK FOR CRACKED CERAMIC FLAME ROD INSULATOR.
CHECK THAT PILOT FLAME COVERS FLAME ROD AND IS STEADY AND BLUE.
ADJUST PILOT FLAME.
IF PROBLEM PERSISTS, REPLACE MODULE.
CHECK FOR 24 VAC ACROSS PV-MV/PV TERMINALS ON MODULE. IF NO VOLTAGE, REPLACE MODULE.
CHECK ELECTRICAL CONNECTIONS BETWEEN MODULE AND GAS CONTROL INCLUDING SAFETY CONTROLS WIRED IN THE CIRCUIT. IF
OKAY, REPLACE GAS CONTROL.
NOTE: IF CONTROL GOES INTO LOCKOUT OR RETRY DELAY, RESET THE “CALL FOR HEAT.”
CHECK CONTINUITY OF IGNITION CABLE AND GROUND WIRE.
NOTE: IF GROUND IS POOR OR ERRATIC, SHUTDOWNS MAY OCCUR OCCASIONALLY EVEN THOUGH OPERATION IS NORMAL
AT THE TIME OF CHECKOUT.
CHECK THAT PILOT FLAME COVERS FLAME ROD AND IS STEADY AND BLUE. PILOT FLAME MUST NOT BE MOVING AROUND DUE TO
OUTSIDE AIR FLOWS, ETC.
ADJUST PILOT FLAME. CHECK GAS PRESSURE MEETS APPLIANCE SPECIFICATIONS WHILE APPLIANCE MAIN BURNER ON AND ALL
OTHER GAS APPLIANCES ON THE SUPPLY ARE OPERATING AT FULL RATE.
IF CHECKS ARE OKAY, REPLACE MODULE.