41
UHE
-
F / EIH
-
F I&O Manual
IM100205
RD: APR 2019
RL: 02C
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