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11. TROUBLESHOOTING GUIDE - HEATER OPERATION
WARNING
SEQUENCE OF EVENTS (also see DSI Troubleshooting previous page)
APPLY 120 VOLTS
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.
YES
SPARK IGNITER / SENSOR
YES
24V TO GAS VALVE
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"
• Check 24VDC Power Unit for 24vdc at the output
NO
• CHECK 120V OUT AT "IND" FROM DSI TO BLOWER
NO
• FAULTY RELAY SWITCH IN DSI — REPLACE DSI
• CHECK TUBING TO SWITCH IS CONNECTED AND
NO
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
• CHECK TUBING TO SWITCH IS CONNECTED AND
NO
• CHECK AIR PRESSURE WITH MANOMETER
• CHECK INTEGRITY OF SWITCH
• REPLACE DEFECTIVE SWITCH
• CHECK FOR AND REMEDY ANY OBSTRUCTION IN
• VISIBLY CHECK IF IGNITER IS SHORTING OUT
NO
• 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 TEMPERA-
TURE; 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 IGNI-
TION CIRCUIT INSTRUCTIONS—Section 22)
• GOOD SPARK.....REPLACE IGNITER
• NO SPARK/OR WEAK.....REPLACE CONTROL
25
NOT BLOCKED OR KINKED
THE VENT / TUBE
HE+ Series Modulating Supplemental Manual
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