Schwank STV-JZ Owner's Manual page 30

RED L.E.D. LIGHT IS ON
MAIN BURNER LIGHTS
NO
YES
SPARK STOPS WHEN
BURNER LIGHTS
NO
YES
SYSTEM RUNS UNTIL CALL
FOR HEAT ENDS
YES NO
CALL FOR HEAT ENDS:
SYSTEM SHUTS OFF
NO
YES
TROUBLESHOOTING ENDS
→CHECK FOR 24 VAC ACROSS GAS VALVE, IF NO
VOLTAGE, REPLACE IGNITION CONTROL
→SPARK IGNITER MAY BE OUT OF POSITION
→CHECK ELECTRICAL CONNECTION BETWEEN
IGNITION CONTROL AND GAS VALVE , IF OKAY,
REPLACE GAS VALVE.
NOTE: IF IGNITION CONTROL GOES INTO
LOCKOUT, RESET SYSTEM.
→CHECK CONTINUITY OF SENSOR CABLE AND
GROUND WIRE
→CHECK THAT BURNER FLAME COVERS THE
ELECTRODE / SENSOR
→IF CHECKS ARE OKAY, REPLACE IGNITION
CONTROL
NOTE: IF IGNITION CONTROLS GOES INTO
LOCKOUT, RESET SYSTEM
→CHECK CONTINUITY OF SENSOR CABLE AND
GROUND WIRE
→NOTE: IF GROUND IS POOR OR ERRATIC, SHUT
DOWNS MAY OCCUR OCCASIONALLY EVEN
THOUGH OPERATION IS NORMAL AT THE TIME
OF CHECKOUT
→IF CHECKS ARE OKAY, REPLACE IGNITION
CONTROL
→CHECK FOR PROPER TEMPERATURE
CONTROLLER OPERATIONS
→REMOVE VALVE LEAD AIR IGNITION CONTROL, IF
VALVE CLOSES, RECHECK TEMPERATURE
CONTROLLER AND WIRING, IF NOT, REPLACE
GAS CONTROL OPERATOR
Page 26
GP-MSJV-BX-07A
STV-JZ Manual
RD: MAR 2009
RL: 07A - BA