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19. TROUBLESHOOTING GUIDE
TURN HEATER ON
YES
24 VOLTS ±10% TO DSI CONTROL
YES
24 VOLTS OUT FROM CONTROL
YES
24 VOLTS AT GAS CONTROL
YES
GAS VALVE OPENS.
YES
SPARK ACROSS IGNITER:
IS HIGH VOLTAGE SPARK OK ?
YES
MAKE SURE THE MANUAL
SWITCH ON THE GAS VALVE IS
'OPEN' AND THAT THERE IS GAS
SUPPLY TO THE VALVE.
*CHECK 120 V AT PRIMARY TRANSFORMER
*CHECK VOLTAGE OUT AT SECONDARY.
NO
*IF THERE IS NOT 24V TO SECONDARY....
.......REPLACE THE TRANSFORMER
*CHECK 24V WIRING FROM TRANSFORMER
TO IGNITION CONTROL / AND CHECK IF
NO
CORRECT GAUGE OF WIRE FOR DISTANCE.
*REPLACE WIRES IF NECESSARY.
*CHECK FOR 24 VAC ACROSS GAS VALVE
TERMINALS ON CONTROL. IF NO VOLTAGE,
NO
.........REPLACE CONTROL.
*ENSURE GAS IS TURNED ON AT VALVE.
*CHECK ELECTRICAL CONNECTIONS AT
CONTROL & GAS VALVE.
NO
*CHECK 24V WIRING CONTINUITY FROM DSI
IGNITION CONTROL TO GAS VALVE, RE-
PLACE WIRES IF NECESSARY.
IF 24V IS PRESENT AND VALVE DOES NOT
OPEN.......REPLACE VALVE
NO
*PERFORM IGNITION LEAD TEST DESCRIBED
IN "SPARK IGNITION CIRCUIT".
*CHECK DSI MODULE IGNITION POST FOR
DEFECTS.
NO
*SPARK IGNITER MAY BE OUT OF POSITION.
*CHECK BOOT OF THE IGNITION CABLE FOR
SIGNS OF MELTING OR BUCKLING. TAKE
PROTECTIVE ACTION TO SHIELD CABLE &
BOOT FROM EXCESSIVE TEMPERATURES.
*CHECK CERAMIC INSULATOR FOR CRACKS *
*CHECK SPARK GAP, 1/8"-3/16" .
*CHECK IGNITION CABLE, AND GROUND
WIRE
38
2100 / IO-100 Manual
IM110107
RD: AUG 2021
R.L. 11A
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