Weil-McLain CGI-4E Boiler User Manual


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Part Number 550-110-711/1108
49
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CGi-4E Gas-Fired Water Boiler — Boiler Manual
Troubleshooting — components11b
Figure 36 Manometer connections
Control module
Solder or water splatter between
plugs and circuit board can cause
improper operation of control mod-
ule. Place a shield over the boiler
internal controls and components
during installation. Failure to com-
ply 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 —
LOCKOUT modes
SeeCharts 1 through 7 in this section for detailed trouble-
shooting procedures.
Toresetcontrolafteralockout,turnoffpoweratthe120VAC
service switch or turn down all thermostats. Wait 45 seconds.
Then restore power or call for heat.
Figure 37 Control module
POWER light flashing alone
Usuallyindicatesreversedpolarityof120VACpowerwires.
POWER and TSTAT CIRC lights flashing
Usually indicates stray voltage on external thermostat circuit
wires (usually due to miswired 3-wire zone valve).
POWER and PRESS SWITCH lights flashing
Usually indicates pressure switch is closed when it should
not be, or pressure switch failed to close within 5 minutes of
inducer starting.
POWER and FLAME lights flashing
Usually indicates false flame sense or flame sensed when it
should not be there.
Control indicator lights —
NON-LOCKOUT modes
POWER light on and FLAME light flashing
Usually indicates pilot flame was not established within 15
secondsfromapplicationofspark.Controlwillashlight,but
will continue to cycle indefinitely until flame is established or
problem is corrected.
POWER light on and PRESS SWITCH light flashing
Usually indicates pressure switch opened during the run
cycle.
Troubleshooting the control module
SeeFigure 38, page 50, for location of harness plug receptacles
and plugs on the control module.
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