Schwank STSp-WP User Manual

Page 29

SP-MSWP-BX-09A

STSp-WP Manual

RD: MAY 2004

RL: 9

Page 25

MAIN BURNER LIGHTS

SPARK STOPS WHEN
BURNER LIGHTS

SYSTEM RUNS UNTIL CALL
FOR HEAT ENDS

CALL FOR HEAT ENDS:
SYSTEM SHUTS OFF

YES

• CHECK FOR GOOD SPARK AT IGNITER.....

(SEE PREVIOUS PAGE)

• CHECK OUTPUT VOLTAGE FROM CONTROL

TERMINALS....IF NONE REPLACE CONTROL.

• CHECK FOR 25 VAC ACROSS GAS VALVE.
• CHECK ELECTRICAL WIRING BETWEEN IGN-

TION CONTROL AND GAS VALVE.... IF
OK, .........REPLACE GAS VALVE.

CONTROL IS NOT SENSING FLAME WITHIN THE
21 SECOND TFI AND IS STILL TRYING TO LIGHT

• CHECK CONTINUITY OF SENSOR CABLE AND

GROUND WIRE.

• CHECK BURNER FLAME IS COVERING SEN-

SOR.

• IF CHECKS ARE OKAY.... REPLACE CONTROL.

NOTE: IF IGNITION CONTROLS GOES INTO A
LOCKOUT,SHUT DOWN BURNER AND RESTART

• CHECK CONTINUITY OF SENSOR CABLE AND

GROUND WIRE AS A POOR GROUND COULD
RESULT IN ERRATIC BEHAVIOUR AND NUI-
SANCE SHUTDOWNS EVEN THOUGH OPERA-
TION IS NORMAL AT THE TIME OF CHECKOUT.

• IF CHECKS ARE OK, .........REPLACE CONTROL

• CHECK TEMPERATURE CONTROLLER.

• CHECK FOR PINCHED WIRING,
• REMOVE GAS VALVE LEAD AT CONTROL, IF

V A L V E C L O S E S , R E C H E C K T H E

TEMPERATURE CONTROLLER AND WIRING,

• IF VALVE STAYS OPEN... REPLACE GAS

VALVE.

TROUBLESHOOTING ENDS

YES

cont’d