GOLD CGa Gas-Fired Water Boiler — Boiler Manual

11b Troubleshooting — standing pilot boilers

CHART 1 Standing pilot — Boiler will not fire

 

 

 

 

 

 

 

 

 

 

 

 

 

Is damper harness securely plugged in at both ends?

 

 

 

Secure connections.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check for loose wire connections or bad relay on

 

 

 

 

 

 

Is 24VAC present across transformer terminals C & Y?

 

transformer.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check for open thermostat, LWCO, high limit, spill switch or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

rollout thermal fuse element contacts or check for loose wire

 

 

 

 

 

Is 24VAC present across transformer terminal C and

connections.

 

 

 

 

 

 

 

yellow wire on vent damper connector?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If LWCO, spill switch or rollout thermal fuse

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

element contacts are open, determine cause

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and correct condition. Failure to do so will

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

cause severe personal injury, death or

 

 

 

 

 

 

Is vent damper rotated open?

 

 

 

substantial property damage.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check/repair out of round stack section. Does vent damper

 

 

 

 

 

Is 24VAC present across gas valve terminals?

rotate open?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace actuator.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Retest.

 

 

 

 

 

 

 

 

 

 

 

Is main flame on now?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Open thermostat contacts for 30 seconds. Vent damper will

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

rotate to closed position. Close thermostat contacts. Vent

 

 

 

 

 

 

Retest

damper will rotate to open position. Is 24VAC present

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

across gas valve terminals?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is gas valve cock turned to ON position?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check continuity of each wire in damper harness. Does continuity exist for each wire? See Table below.

No

Yes

 

 

 

Turn gas valve cock to ON position. Retest.

Replace gas valve. Retest.

Replace damper wiring harness. Retest.

Remove damper harness from damper harness plug. TEMPORARILY install jumper between terminal 2 and terminal 5 on damper plug in boiler wiring harness. See figure, right. Does boiler fire?

No

Yes

 

 

 

 

Replace gas valve. Retest.

Replace damper actuator. Retest.

Part Number 550-101-009/0107

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Weil-McLain CGA25SPDN manual 11b Troubleshooting standing pilot boilers, Chart 1 Standing pilot Boiler will not fire

CGA25SPDN specifications

The Weil-McLain CGA25SPDN is a high-efficiency gas-fired boiler designed to deliver dependable heating performance while maintaining a strong focus on energy savings and user-friendly operation. Ideal for residential applications, this boiler is engineered to provide consistent warmth and comfort in homes with various heating demands.

One of the main features of the CGA25SPDN is its durable construction. Built with high-quality materials, this boiler is designed to withstand the rigors of frequent operation while maximizing longevity. It features an advanced cast iron heat exchanger that efficiently transfers heat to the water, resulting in lower energy costs and improved overall performance.

Efficiency is a key characteristic of the Weil-McLain CGA25SPDN. Its design promotes efficient combustion, allowing for a higher Annual Fuel Utilization Efficiency (AFUE) rating. With an AFUE rating of up to 82%, this boiler ensures that more of the fuel used is converted into usable heat, which translates to reduced energy bills for homeowners.

The boiler exhibits a user-friendly control system that allows for easy operation and maintenance. It comes equipped with an integrated vent damper that maximizes efficiency by reducing heat loss during standby periods. Additionally, the CGA25SPDN features an adjustable thermostat, enabling homeowners to customize their heating preferences easily.

Another significant feature of the CGA25SPDN is its versatility. The boiler is compatible with various heating applications, including hot water heating systems and home heating configurations. This adaptability makes it a great choice for both new installations and retrofitting existing systems.

Safety is always a concern with gas-fired appliances, and the Weil-McLain CGA25SPDN addresses this through its advanced safety mechanisms. The boiler incorporates safety controls that prevent overheating and ensure proper operation, providing peace of mind to homeowners.

In summary, the Weil-McLain CGA25SPDN stands out as a reliable and efficient heating solution for residential settings. With its durable construction, high-efficiency performance, user-friendly controls, and impressive safety features, it is an exceptional choice for those seeking a dependable gas-fired boiler that meets modern heating demands while keeping energy costs in check. Homeowners can trust the Weil-McLain CGA25SPDN for warmth and comfort through the cold months.