Weil-McLain CGA25SPDN manual Verify Sequence

GOLD CGa Gas-Fired Water Boiler — Boiler Manual

11c Troubleshooting — spark-pilot boilers (continued)

CHART 7 — Spark-ignited pilot — Insufficient heat or no heat (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

Is boiler System circulator operating?

call for heat? If not, wait 5 minutes. Is system heating?

No

Yes

• 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

• Remove CIRCULATOR harness plug from

valve, relay, etc.) wiring. Correct problems and retry.

CIRCULATOR plug receptacle (Figure 30,

• Reconnect external thermostat wiring at boiler.

Item 7, page 53). Check with voltmeter across

Is thermostat circuit closed (continuity across wires)?

pins of control module receptacle.

Does voltmeter show 120 VAC across pins?

No

Yes

No

Yes

• Boiler is in standby.

Are all red lights off?

•

Set thermostat to call for

•

Replace control

•

Repair/replace

heat and recheck

No

Yes

module.

circulator. Retest.

operation.

•

Retest.

•

Repair/replace

•

Verify Sequence of

wiring. Retest.

operation, Figure 24,

Wait 30 seconds.

Are all red lights off?

page 37.

No

Yes

•

Wait 5 minutes.

Is FLAME light on?

Replace control module.

Yes

No

Retest.

• If you have sufficient heat — boiler should be in normal

Is LIMIT light on?

operating sequence. (See normal sequence of operation,

Figure 24, page 37.)

No

Yes

• If you have less than sufficient heat —

Is vent or combustion air piping free of blockage?

•

Check limit switch

•

Replace control module.

No

Yes

contacts with continuity

•

Retest.

checker.

•

Correct conditions and

Contact your Weil-McLain

Are limit switch contacts

recheck operation.

sales representative.

closed?

• See Figure 24, page 37

Check spill switch and

No

Yes

for normal sequence of

rollout switch continuity —

operation.

are switches closed?

No

Yes

• Wait for boiler water to cool to temperature 20 to 30 °F

lower than temperature set on limit switch.

Are limit switch contacts closed?

• Reset spill switch, or replace

rollout switch.

No

Yes

•

Check any other

• Boiler water temperature exceeded

If rollout thermal fuse element or

limit controls wired

setting on limit switch with thermostat

spill switch has opened, determine

into the limit

•

Replace

calling for heat. Boiler is OK.

cause and correct condition.

circuit. If all are

Failure to do so will cause severe

OK, then replace

limit switch.

• Also check setting on limit switch (should

personal injury, death or

control module.

•

Retest.

be above 140°F.).

substantial property damage.

•

Retest.

Part Number 550-101-009/0107