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MAIN BURNER LIGHTS
YES
SPARK STOPS WHEN BURNER LIGHTS
YES
SYSTEM RUNS UNTIL CALL FOR HEAT
ENDS
YES
CALL FOR HEAT ENDS:
SYSTEM SHUTS OFF
YES
TROUBLESHOOTING
ENDS
SPW2, STW2(S) / IWP2, IW2(S) I&O Manual
IM170629
RL: 03C
RD: APR 2019
NO
• CHECK FOR STRONG SPARK AT IGNITER........
• (SEE PREVIOUS PAGE).
• CHECK FOR 24 VAC ACROSS GAS VALVE.
• CHECK OUTPUT VOLTAGE FROM CONTROL TER-
MINALS TO GAS VALVE.....IF NO VOLTAGE RE-
PLACE CONTROL.
• CHECK ELECTRICAL WIRING, AND VOLTAGE BE-
TWEEN IGNITION CONTROL AND GAS VALVE.
• IF OK, REPLACE GAS VALVE.
NO
CONTROL IS NOT SENSING FLAME WITHIN THE 20
SECOND TFI AND IS STILL TRYING TO LIGHT
• CHECK CONTINUITY OF SENSOR CABLE AND
GROUND WIRE
• CHECK BURNER FLAME IS COVERING SENSOR.
• CHECK FLAME SIGNAL IN SERIES WITH THE
GROUND AND MODULE FOR 1.5UA MINIMUM.
• IF SIGNAL IS LOWER CHANGE IGNITER.
• IF CHECKS ARE OK.......REPLACE CONTROL.
NO
NOTE: IF IGNITION CONTROLS GOES INTO A
LOCKOUT, INTERRUPT POWER AND RESTART.
• CHECK CONTINUITY OF SENSOR CABLE AND
GROUND WIRE AS A POOR GROUND COULD RE-
SULT IN ERRATIC BEHAVIOUR AND NUISANCE
SHUTDOWNS EVEN THOUGH OPERATION IS NOR-
MAL AT THE TIME OF CHECKOUT.
• CHECK FOR EXCESSIVE HEAT AT SENSOR INSU-
LATOR AS TEMPERATURES ABOVE 1000°F(538°C)
CAUSES SHORT TO GROUND.
• CHECK FLAME SIGNAL IN SERIES WITH THE
GROUND AND MODULE FOR A MINIMUM 1.5UA.
• IF SIGNAL IS LOWER CHANGE IGNITER.
• IF CHECKS ARE OK.....REPLACE CONTROL.
NO
• CHECK TEMPERATURE CONTROLLER.
• CHECK FOR FAULTY WIRING, REMOVE GAS
VALVE LEAD AT CONTROL ,
• IF VALVE CLOSES, RECHECK THE TEMPERATURE
CONTROLLER AND WIRING.
• IF VALVE STAYS OPEN....REPLACE GAS VALVE
46
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