Schwank STS-JZ Installation & Owner's Manual page 48

SPARK AT IGNITER / SENSOR
YES
24V TO GAS VALVE - RED LIGHT IS ON
YES
MAIN BURNER LIGHTS
YES
MAIN BURNER LIGHTS, BUT SHUTS
OFF IMMEDIATELY
NO
CONTINUED
STS-JZ-F / IQ-F I&O Manual Z83.20-2016
IM101220
RD: APR 2019
RL: 20C
NO
• CHECK IF SPARK IS MISDIRECTED TO SIDE OF
IGNITER AND NOT ACROSS GAP ... RESET IGNIT-
ER GAP & ALIGNMENT
• CHECK THAT IGNITER IS GROUNDED
• REMOVE AND INSPECT IGNITER AND LEAD CABLE
• CHECK CERAMIC INSULATOR FOR DAMAGE
• CHECK SPARK GAP SETTING IS 3/16" (ADJUST BY
MOVING THE GROUND PRONG ONLY)
• PERFORM IGNITION LEAD TEST
• GOOD SPARK RESULTS .....REPLACE IGNITER
• NO SPARK / OR WEAK.....REPLACE CONTROL
• CHECK OUTPUT VOLTAGE FROM CONTROL TER-
NO
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
• 24V IS PRESENT TO VALVE BUT NO RED LIGHT,
REPLACE RED LIGHT
• CHECK GAS SUPPLY TO VALVE (MIMIMUM 5" N.G.
NO
or 11" L.P.)
• IF INSUFFICIENT REMEDY GAS SUPPLY
• CHECK MANIFOLD PRESSURE (3.5" N.G. or 10"
L.P.)
• IF NO MANIFOLD PRESSURE, REPLACE
GAS VALVE
• IF INSUFFICIENT ADJUST MANIFOLD PRES-
SURE
• SUFFICIENT MANIFOLD PRESSURE, BUT STILL NO
FLAME
• REMOVE BURNER CUP AND INSPECT FOR
DAMAGE
• REMOVE ORIFICE & CHECK FOR BLOCK-
AGE
• CHECK THAT TUBE STATIC PRESSURE AT
YES
BLOCKED FLUE SWITCH IS BELOW THE SWITCH
SETTING
• CHECK FOR BLOCKAGE IN TUBE / VENT SYSTEM
• CONFIRM VENT AND TOTAL SYSTEM LENGTHS
ARE WITHIN SPECIFICATIONS
• CONFIRM CORRECT TURBULATOR SIZE & PLACE-
MENT
• IF SWITCH OPENS BELOW SET POINT, REPLACE
SWITCH
48