33
P40-R I&O Manual
IM120801
RD: AUG 2013
RL: 1D
MAIN BURNER LIGHTS
SYSTEM RUNS UNTIL CALL FOR HEAT
ENDS
CALL FOR HEAT ENDS:
SYSTEM SHUTS OFF
TROUBLESHOOTING ENDS
SEE S87J DSI CHECK
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.
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.
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
SPARK STOPS WHEN BURNER LIGHTS
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 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
YES
NO
YES
YES
YES
NO
NO
