Weil-McLain CGi 4 Series Manual page 51

CGi
SERIES 4 — GAS-FIRED WATER BOILER —
11b
Troubleshooting — components
The information on this page
and pages 52 through 60 ap-
ply only to spark-ignited pilot
CGi boilers. These boilers
are equipped with an ignition
control module that has indi-
cator lights to show control
status. Charts 1 through 8,
pages 53-60, help you identify
problems based on indicator
light conditions.
Figure 37 Control module
Control module
Solder or water
between plugs and circuit
board can cause improper
operation of control mod-
ule. Place a shield over the
boiler internal controls and
components during installa-
tion. Failure to comply could
result in severe personal
injury, death or substantial
property damage.
Make sure
is installed per wiring
ing
diagram. Good grounding
is extremely important for
proper operation.
Part Number 550-142-302/0124
Boiler Manual
Control indicator lights —
LOCKOUT modes
See Charts 1 through 8 in this section for detailed trouble-
shooting procedures.
Control indicator lights —
HARD LOCKOUT Summary (Flashing LED's)
MAY remove 120VAC 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
POWER
Flashes once per second
Flash code 2*
Flash code 3*
Flash code 4*
Flash code 5*
Flash code 6*
Flashes once per second
* Flash code pattern: POWER LED flashes 2, 3, etc. times
ALL LED'S FLASHING
SOLID LWCO LED
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
POWER + TSTAT/CIRC
POWER + PURGE
POWER + FLAME
splatter
CAUTION Summary (Flashing LED's)
INDICATOR LIGHT
PURGE
LIMIT
FLAME
LWCO
ground wir-
Troubleshooting the control module
See Figure 38, for location of harness plug receptacles and plugs
on the control module.
rapidly followed by 2 seconds off, then repeats.
CONDITION
High voltage detected on TSTAT circuit.
Pressure Switch stuck open or closed.
Flame sensed without call for heat or out
of sequence during ignition trial.
CONDITION
Pressure switch opened after it had been
proven closed.
Fault detected in temperature sensing
hardware.
Flame loss or flame not sensed during
trial for ignition.
LWCO circuit approaching lockout state.
Sensor requires maintenance. LWCO
LED will flash 3 times when maintenance
is required.
(continued)
CONDITION
120 VAC connection to boiler
reversed or there is insufficient
earth ground.
Internal fault, microprocessor or
memory.
Internal fault, LWCO circuit.
Unused.
Internal fault, water thermistors
disagree.
Internal fault, gas valve circuit.
Failure to establish pilot
flame after 4 attempts.
Low water condition occurred.
51