Part Number 550-142-300/0520
49
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
Figure 29
CGa/EG Ignition control module
The information on this page and
pages 50 through 57 apply only to
spark-ignited pilot CGa boilers.
These boilers are equipped with
an ignition control module that
has indicator lights to show control
status. Charts
1
through
7
, pages
51- 57, help you identify problems
based on indicator light condi-
tions.
Troubleshooting — spark-pilot boilers
11b
Control module
Solder or water
splatter be-
tween plugs and circuit board
can cause improper operation of
control module. Place a shield over
the boiler internal controls and
components during installation.
Failure to comply could result in
severe personal injury, death or
substantial property damage.
Make sure
ground wiring
is in-
stalled per wiring diagram. Good
grounding is extremely important
for proper operation.
Control indicator lights —
HARD LOCKOUT Summary (Flashing LED’s)
MAY remove 120 VAC power for more than 2 seconds to clear lockout OR
ignition control will automatically restart sequence of operation after 1 hour
waiting period after fault condition is cleared.
INDICATOR LIGHT
CONDITION
POWER
Flashes once per second
120 VAC connection to boiler
reversed
or there is insufficient
earth ground.
Flash code 2*
Internal fault, microprocessor or
memory.
Flash code 3*
Internal fault, LWCO circuit.
Flash code 4*
Unused.
Flash code 5*
Internal fault, water
thermistors
disagree.
Flash code 6*
Flashes once per second
Internal fault, gas valve circuit.
* Flash code pattern: POWER LED flashes 2, 3, etc. times
rapidly followed by 2 seconds off, then repeats.
ALL LED’S FLASHING
Failure to establish pilot
flame after 4 attempts.
SOLID LWCO LED Low water condition occurred.
SOFT LOCKOUT Summary (Flashing LED’s)
MAY remove 120VAC power for more than 2 seconds, cycle thermostat for
between 2 and 20 seconds, OR ignition control will automatically restart
sequence of operation after 1 hour waiting period.
INDICATOR LIGHT
CONDITION
POWER + TSTAT/CIRC
High voltage detected on TSTAT circuit.
POWER + DAMPER
Damper stuck closed or unable to close end
switch within 45 seconds from TSTAT call.
POWER + FLAME
Flame sensed without call for heat or out
of sequence during ignition trial.
CAUTION Summary (Flashing LED’s)
INDICATOR LIGHT
CONDITION
DAMPER
Damper end switch opened after it had
been proven closed.
LIMIT
Fault detected in temperature sensing
hardware.
FLAME
Flame loss or flame not sensed during
trial for ignition.
LWCO
LWCO circuit approaching lockout state.
Sensor requires maintenance. LWCO
LED will flash 3 times when maintenance
is required.
Troubleshooting the control module
See
Figure 30
, page 50,
for location of harness plug receptacles and plugs on the
control module.