13
CONDITION E
GC-4 LIGHT BLINKING
Turn the Rocker Switch OFF and ON. Observe GC-4 light and clock ON time before it begins to blink.
If Red or Amber Lights OFF, replace lamp or switch.
If the boiler starts and runs, a temporary problem may have corrected itself, (I.E., low gas pressure or a blockage
of the inlet, etc). However, there may also be a slow draining condensate or a partially blocked exhaust, see
Blocked Exhaust under “CONDITION #2B”. Stop and start the boiler a number of times to assure normal
operation has been restored.
If boiler does not ignite or ignition is rough - see “CONDITION 2.”
If GC-4A light is ON 3 min, 30 sec., then starts blinking and boiler attempted ignition - proceed to “CONDITION 2”.
If GC-4A light is ON 3 min, 30 sec., then starts blinking and if boiler “coughs” or does not attempt ignition, pro-
ceed to “CONDITION 2”.
If GC-4A light is ON 2 min, 45 sec., then begins to blink, measure fan pressure (see “PROCEDURES” section)
and use one of the two procedures below.
MODEL NO.
MINIMUM FAN PRESSURE (PS2)
AM-100/-150
+1.4" W.C.
AM-300
+0.8" W.C.
1.
If measured fan pressure exceeds the minimum for fan prove switch (PS2) operation.
POSSIBLE CAUSE
VERIFICATION
SOLUTION
Wiring
Turn Rocker Switch OFF. Remove
If no continuity, check wire and
the 6-pin Molex connector from the
connectors until continuity is
the GC-4A. (Keep Fan Switch (PS2)
obtained - reconnect Molex to GC-4A
jumper in place). With an Ohm-
and run Fan Prove Switch check.
meter check for continuity across
pin-4 (grey) and 5 (lt.blue).
If continuity but, condition above
exists-replace GC-4A.
Fan Prove Switch (PS2)
**Turn Rocker Switch OFF. Turn
If boiler starts, (PS2) pressure
(N.O.) contacts
Rocker Switch ON. Jumper pressure
switch is defective - replace it.
(Factory Fixed Setting)
switch (PS2) contacts.
If the GC-4A light begins to blink after
2 min. 45 sec., (PS2) switch is ok.
Proceed with check.
If the boiler attempts to start and the
GC-4A light blinks after 3 min.30 sec.,
(PS2) switch is defective - replace it.
** NOTE: Fan must be operating before placing jumper across swith PS2. Always remove jumper before resetting
boiler.