Weil-McLain Series 2 manual 11b Troubleshooting — components continued, Control indicator lights

GOLD CGi Gas-Fired Water Boiler — Boiler Manual

11b Troubleshooting — components (continued)

		POWER light flashing alone
Figure 36	Manometer connections
		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
		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 38, page 50, for location of harness plug receptacles
	and plugs on the control module.
Control module
	Figure 37  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.

Part Number 550-110-710/0107 49