39
REPLACE FAN/IMPELLER
GC-4A "QUICK CHECK" TROUBLESHOOTING GUIDE
CHECK FAN OPERATION
FOR AT LEAST
3-1/2 MIN.
AFTER RED
LIGHT IS ON
CHECK
BULB
FLIP SW. - IT MAY BE OFF
CHECK FOR 115V TO BOILER AT TERM. STRIP
CHECK FOR 115V TO TERM. 2 & 3 ON SWITCH
CHECK BULB
CHECK OPERATING CONTROL (T'STAT, HI-LIMIT, LWCO, ETC.)
CHECK 115/24V TRANSFORMER
REPLACE PRESS. SW.
CHECK 24V CONTROL
WIRING AND GROUND
JUMPER WIRE.
REPLACE GC-4A CONTROL
ON AM-150
ONLY
REPLACE
SWITCH
REPLACE
GC-4A
“BLINKS” OR IS ON FOR 6 OR LESS
SECONDS - BOILER MAY START
THEN STOP
45 SECONDS OR
MORE AFTER RED
LIGHT IS ON
REPLACE SPARK PLUG
*
GREEN LIGHT
& BOILER OFF
AT SAME TIME
REPLACE PRESS. SW.
REPLACE GC-4A
OPEN VALVES
REPLACE VALVE
REPLACE GC-4A
REPLACE WIRE
HARNESS
REPLACE SPARK
PLUG
*
REPLACE PS1
SECURE WIRES
REPAIR OR
REPLACE AS
REQUIRED
ON
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
ON
OFF
ON
OFF
ELECTRICAL SYSTEM CHECK FOR BOILERS EQUIPPED WITH THE GC-4A IGNITION CONTROL
ON AM SERIES
BOILER ONLY
TURN ON/OFF SW.
ON & OFF
REPLACE SPARK PLUG.
*
CHECK IGN. WIRE
AND BOOT ON SPARK PLUG - REPLACE IF
WORN
REFER TO TROUBLESHOOTING GUIDE FOR MECHANICAL PROBLEMS
WHICH WOULD PREVENT THE BOILER FROM OPERATING
REPLACE GC-4A
YES
NO
CHECK IGN. WIRE &
BOOT ON SPARK PLUG
BOILER STUTTERS OR STOPS
BEFORE GREEN LIGHT GOES OUT
YES
NO
ON
OFF
BLINKING
ON
OFF
BLINKING
MPTS-44
YES
NO
ON
OFF
NO
YES
*
USE SPARK PLUG
CHAMPION FI-21503
DO THE FAN PROVE (PS2) SW.
CONTACTS CLOSE WHEN FAN OPERATES
AMBER LIGHT ON
BOILER ON/OFF SW.
RED BOILER LIGHT
CHECK LIGHT ON
GC-4A IGN. CONTROL
GREEN BOILER
LIGHT
CHECK LIGHT ON
GC-4A IGN. CONTROL
TURN ON/OFF SW. “ON” &
“OFF” AFTER 10 SEC. IS GC-4A
LIGHT “ON”
REMOVE 6 PIN CONNECTOR FROM GC-4A
AND CHECK IF 24V FROM PIN 2
BROWN WIRE) TO GROUND
CHECK COMB. PROVE PRESS. SW. (PS1)
FOR CONTINUITY
CHECK BLOCKED INLET
PRESS. SW. (PS3) CONTACTS
FOR OPEN CIRCUIT
CHECK PRESSURE LINES
FROM G.C.C. VALVE PLATE
TO COMB. PROVE PRESS.
SW. FOR CRACKS, ETC.
IS THERE 115 VOLTS TO FAN MOTOR
IS THE PURGE FAN OPERATIONAL
1.4" W.C. (AM-100 & 150) MINIMUM;
.8" W.C. AM-300 MINIMUM.
IS THERE 24 VOLTS TO GAS VALVE
CHECK PURPLE WIRES TO PS1
AND THE GC-4A ARE TIGHT
CHECK PRESS. SW. PS1
JUMPER CONTACTS WHEN
BOILER STARTS
(CAUTION-HIGH VOLTAGE)
DOES BOILER RUN BEYOND 8
SECS. WITH JUMPER IN PLACE
DOES THE SPARK PLUG FIRE
CHECK IGN. LEAD FOR CONTINUITY.
IS THERE CONTINUITY
IS THERE SPARK AT THE GC-4A IGN.
TRANSFORMER
DOES THE COMBINATION GAS
VALVE OPEN
ARE ALL GAS LINE VALVES OPEN
LIGHTS FOR 8 SEC. AT 30 SEC.
INTERVALS - 5 TIMES TO LOCK OUT.
BOILER ATTEMPTS TO START
BOILER STARTS AND
RUNS FOR MORE THAN
10 SECONDS AND STOPS
(BOILER STOPS THEN
GREEN LIGHT GOES OFF,
RED LIGHT REMAINS ON)
THE PROBLEM IS NOT
ELECTRICAL - CHECK FOR
RECIRCULATION - CHECK
G.C.C. - REFER TO
TROUBLESHOOTING
GUIDE.
