37
STR-JZ I&OManual
IM090831
RD: AUG 2009
RL: 09A - BA
CHECK 120V SUPPLY TO RELAY SWITCH
IF ELECTRICAL SUPPLY PROBLEM …. MAKE RE-
QUIRED REPAIR TO RESTORE 120V
CHECK FOR 120V FROM RELAY SWITCH
IF “NO” SWITCHING IS OCURRING......REPLACE
THE RELAY SWITCH
SET THERMOSTAT TO CALL FOR HEAT
APPLY 120 VOLTS -
GREEN LIGHT IS ON
CHECK IF 120 VOLTS PRESENT AT BLOWER
IF “YES”.....REPLACE DEFECTIVE BLOWER
COMBUSTION AIR BLOWER STARTS
A.P.S. HAS CLOSED (B.F.S. IS CLOSED)
24 VOLTS PRESENT AT DSI CONTROL.
AMBER LIGHT IS ON
CHECK FOR OBSTRUCTION IN THE AIR INTAKE
AND FLUE
CHECK TUBING TO SWITCHES IS CONNECTED
AND NOT BLOCKED OR KINKED
CHECK IF AIR PROVING SWITCH IS CLOSING
WHEN BLOWER IS RUNNING
CHECK AIR PRESSURE WITH MANOMETER
REPLACE ANY DEFECTIVE SWITCH
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 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
SPARK IGNITER / SENSOR
24V TO GAS VALVE - RED LIGHT IS ON
CONTINUED
SEQUENCE OF EVENTS
21. TROUBLESHOOTING GUIDE
NO
YES
WARNING
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
YES
YES
NO
NO
CHECK 24V SUPPLY TO RELAY SWITCH
NO
