Dunkirk Q90-200 Series II - Manual (Page 44)

44
Troubleshooting Chart 4
IGNITER/SENSOR WARMS
UP AND GLOWS
YELLOW/ORANGE
DURING 20 SECOND
WARM UP
CHART 3
YES
NO
CHECK FOR 120 VAC
BETWEEN TERMINALS 1
AND 2 AT CONNECTOR
CN1 ON IBC (DURING
IGNITER WARM UP)
NO
REPLACE IBC
YES
CHECK FOR 120 VAC AT
IGNITER/SENSOR LEADS
ON WIRING HARNESS
(DURING IGNITER
WARM UP)
NO REPAIR/REPLACE WIRING
FROM IBC
TO IGNITER/SENSOR
YES
REPLACE IGNITER/SENSOR
AFTER 20 SECOND
IGNITER WARM UP, GAS
VALVE IS ENERGIZED
VALVE LIGHT IS ON
2 SECONDS LATER POWER
IS REMOVED FROM
IGNITER/SENSOR
IGNITER LIGHT IS OFF
DOES MAIN BURNER
LIGHT?
CHECK FOR 24 VAC
ACROSS TERMINALS MV
ON THE GAS CONTROL.
WHILE VALVE/FLAME
INDICATOR LIGHT IS ON
NO NO
CHECK FOR 24 VAC
ACROSS TERMINALS
CN6-2 AND CN6-5 ON
IBC, WHILE THE VALVE/
FLAME LED IS LIT
NO
REPLACE IBC
YES
REPAIR/REPLACE WIRING
BETWEEN IBC AND
GAS CONTROL
YES
CHECK IF IGNITER/
SENSOR POSITION IS OK?
TIP SHOULD BE SLANTED
TOWARDS BURNER
RESTORE IGNITER/SENSOR
TO CORRECT POSITION.
DO NOT RELOCATE
NO
YES
CHECK GAS SUPPLY
PRESSURE AT INLET
PRESSURE TAPPING ON
GAS CONTROL IS GAS
PRESSURE GREATER
THAN 4.0" W.C.?
NO
ARE ALL MANUAL
SHUT-OFFS IN THE GAS
SUPPLY LINE AND ON
THE GAS CONTROL IN
THE OPEN OR ON
POSITION?
OPEN OR TURN ON ALL
MANUAL SHUTOFFS
NO
YES
CONTACT THE GAS UTILITY
TO TURN THE GAS ON
YES
CHART 5 CHART 5
YES
YES
15 - TROUBLESHOOTING