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28. TROUBLESHOOTING GUIDE
WARNING
SEQUENCE OF EVENTS
APPLY 120 VOLTS - GREEN LIGHT
IS ON
SET THERMOSTAT TO CALL FOR HEAT
COMBUSTION AIR BLOWER
STARTS
YES
AIR PROVING SWITCH HAS
CLOSED 24 VOLTS IS PRESENT
AT "PSW" AT DSI CONTROL.
YES
BLOCKED FLUE SWITCH IS
CLOSED
24 VOLTS IS PRESENT AT "TH" AT
DSI CONTROL.
AMBER LIGHT IS ON
YES
SPARK IGNITER / SENSOR
YES
24V TO GAS VALVE - RED LIGHT
IS ON
CONTINUED
Improper adjustment, alteration, service or maintenance can
cause property damage, injury or death. This heater must be
installed and serviced only by a trained gas service technician.
NO
REMEDY 120 VOLTS SUPPLY FAULT
•
CHECK 120V TO DSI AT "L1"
•
NO
CHECK 120V OUT AT "IND" FROM DSI TO BLOWER
•
NO
•
•
NO
•
•
•
•
•
CHECK TUBING TO SWITCH IS CONNECTED
•
NO
AND NOT BLOCKED OR KINKED
CHECK AIR PRESSURE WITH MANOMETER
•
CHECK INTEGRITY OF SWITCH
•
REPLACE DEFECTIVE SWITCH
•
CHECK FOR AND REMEDY ANY OBSTRUCTION
•
IN THE VENT / TUBE
NO
CHECK DSI CONTROL FUSE FOR CONTINUITY
•
VISIBLY CHECK IF IGNITER IS SHORTING OUT
•
CHECK GROUND WIRING
•
REMOVE AND INSPECT IGNITER AND LEAD
•
CHECK BOOT OF THE IGNITION CABLE FOR
•
SIGNS OF MELTING OR OVERHEATING
IF "YES" ... TAKE PROTECTIVE ACTION TO
•
SHIELD CABLE AND BOOT FROM EXCESSIVE
TEMPERATURE; REPLACE ANY DEFECTIVE
COMPONENT
CHECK CERAMIC INSULATOR AND CAP
•
CHECK SPARK GAP SETTING IS 3/16" (ADJUST
•
BY MOVING THE GROUND PRONG ONLY)
PERFORM IGNITION LEAD TEST (See SPARK
•
IGNITION CIRCUIT INSTRUCTIONS—Section 22)
GOOD SPARK.....REPLACE IGNITER
•
NO SPARK/OR WEAK.....REPLACE CONTROL
•
41
FAULTY RELAY SWITCH IN DSI — RE-
PLACE DSI
CHECK TUBING TO SWITCH IS CONNECTED
AND NOT BLOCKED OR KINKED
CHECK AIR PRESSURE WITH MANOMETER
CHECK FOR OBSTRUCTION IN THE AIR INTAKE
REPLACE DEFECTIVE BLOWER
CHECK INTEGRITY OF SWITCH
REPLACE DEFECTIVE SWITCH
HE Series Infrared Gas Heater Installation and Operation Manual
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