Weil-McLain Series 2 manual Verify Sequence

GOLD CGi Gas-Fired Water Boiler — Boiler Manual

11c Troubleshooting — control module lights (cont.)

CHART 7 — Insufficient heat or no heat to system (POWER light on steady)

Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow instructions could result in severe personal injury, death or substantial property damage.

• Has it been at least 5 minutes since setting thermostat to call for heat? If not, wait 5 minutes. Is system heating?

•Is thermostat set to call for heat? Remove thermostat wires at boiler and check continuity across the two wires. If circuit isn't closed, check external thermostat (zone valve, relay, etc.) wiring. Correct problems and retry.

•Reconnect external thermostat wiring at boiler.

Is thermostat circuit closed (continuity across wires)?

	No			Yes
			• Boiler is in standby.
Are all red lights off?			•	Set thermostat to call for
				heat and recheck
No		Yes
				operation.
			•	Verify Sequence of
Wait 30 seconds.				operation, Figure 30,
				page 37.
Are all red lights off?
No		Yes

Replace control module. Retest.

•If you have sufficient heat — boiler should be in normal operating sequence. (See normal sequence of operation, Figure 30, page 37.)

•If you have less than sufficient heat —

Is vent piping free of blockage?

	No		Yes
•	Correct conditions and	•	Check heat loss
	recheck operation.		calculation versus boiler
•	See Figure 30, page 37		size.
	for normal sequence of	•	Clock gas input.
	operation.

•Wait for boiler water to cool to temperature 20 to 30 °F lower than temperature set on limit switch.

Are limit switch contacts closed?

	No		Yes
		• Boiler water temperature exceeded
		setting on limit switch with thermostat
•	Replace	calling for heat. Boiler is OK. (See normal
		sequence of operation, Figure 30, p. 37.)
	limit switch.
		• Also check setting on limit switch (should
•	Retest.
		be above 140°F.).

Is boiler System circulator operating?

No Yes

•Remove CIRCULATOR harness plug from CIRCULATOR plug receptacle (Figure 38,

Item 7, page 50). Check with voltmeter across pins of control module receptacle.

Does voltmeter show 120 VAC across pins?

No

Yes

•

Replace control

•

Repair/replace

module.

circulator. Retest.

•

Retest.

•

Repair/replace

wiring. Retest.

•

Wait 5 minutes.

Is FLAME light on?

Yes

No

Is LIMIT light on?

No

Yes

•

Check limit switch

•

Replace control module.

contacts with continuity

•

Retest.

checker.

Are limit switch contacts

closed?

Check rollout switch

No

Yes

continuity — is switch

closed?

No

Yes

•

Replace rollout switch.

•

Check any other

If rollout thermal fuse element has

limit controls wired

opened, determine cause and

into the limit

correct condition. Failure to do so

circuit. If all are

will cause severe personal injury,

OK, then replace

death or substantial property

control module.

damage.

•

Retest.

Part Number 550-110-710/0107 57