Weil-McLain GOLD CGS 550-110-260/0107 - Manual (Page 45)

Part number 550-110-260/0107
45
GOLD CGs Gas-Fired Water Boiler — Boiler Manual
Troubleshooting — control module
11c
Control module
Solder or water splatter between 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 installed 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 10 VAC
service switch or turn down all thermostats. Wait 45 seconds.
Then restore power or call for heat.
POWER light flashing alone
Usually indicates reversed polarity of 10 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
shouldn’t 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 flash 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 25 , page 46, for location of harness plug receptacles
and plugs on the control module.