TROUBLESHOOTING

!WARNING

Fire, explosion or shock hazard. Do not attempt to modify the physical or electrical characteristics of this boiler in any way. Failure to comply could result in death or serious injury.

Important

1.In reset from lockout condition, all electrical meter readings at the gas control valve (24 vac) must be taken within trial for ignition period.

2.If any component does not function properly, make sure it is correctly installed and wired before replacing it.

3.Static electricity discharge can damage integrated boiler control (IBC). Touch metal surface to discharge static electricity before touching IBC.

4.IBC cannot be repaired. If it malfunctions it must be replaced.

5.Only trained service technicians should service IBC systems. Following troubleshooting, check out system following sequence of operation for a normal light off sequence.

6.All controls are factory tested in the assembly process and a defective control is generally the least likely cause. If you suspect you have a defective control, read through this section before you replace it.

7.It is extremely unlikely that the two consecutive controls are defective. If it seems to be happening, chances are that either there is nothing wrong with the control or it is being damaged by some other problem (an electrical short burning out a transformer, for example).

Initial Service Checks

1.Before troubleshooting:

A.Make sure that circuit breaker is on or fuse is ok at electrical panel.

B.Make sure that service switch is on.

C.Make sure that gas is on at the gas meter, at all appropriate manual shutoff valves and at the gas control valve.

D.Make sure that the thermostat is calling for heat.

E.Check that wire connectors at the integrated boiler control and at the originating control are securely plugged in or connected.

F.Check that hoses are securely connected and are not plugged or damaged.

2.Troubleshooting tools:

A.Voltmeter to check 120 vac and 24 vac

B.Continuity tester.

C.Inclined manometer or pressure gauge with

0-3.0” Range (0.01” Scale) for measuring suction pressures at pressure switch.

D.U-tube manometer or differential pressure gauge with 0-14” range (0.1” Scale) for measuring inlet and manifold gas pressures.

3.IBC Error Codes.

A.IBC uses advanced diagnostic capability to assist in troubleshooting error conditions. Table 10, Page 48 shows error codes that may arise during fault condition.

B.State Conditions shown in Table 9, Page 40 provide suggestions for servicing these potential errors.

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Lennox International Inc Gas-Fired Hot Water Boiler, GWB9-075IH-2, GWB9-100IH-2 Troubleshooting, Initial Service Checks
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GWB9-050IH-2, GWB9-100IH-2, GWB9-075IH-2, Gas-Fired Hot Water Boiler specifications

Lennox International Inc. is a prominent player in the HVAC industry, renowned for its innovative solutions and high-efficiency products. Among its standout offerings is the GWB8 Gas-Fired Hot Water Boiler, available in various models including GWB8-262E-2, GWB8-245E-2, GWB8-280E-2, and GWB8-299E-2. These units are designed to provide reliable and efficient heating solutions for residential applications.

One of the key features of the GWB8 series is its energy-efficient operation. These boilers are designed to achieve an AFUE (Annual Fuel Utilization Efficiency) rating of up to 84%, allowing homeowners to save on energy costs while reducing their environmental footprint. The product utilizes a cast-iron heat exchanger, which promotes optimal heat retention and distribution, ensuring consistent performance throughout the heating season.

The GWB8 series incorporates advanced technologies to enhance comfort and efficiency. A significant innovation is the use of a power venter system that facilitates venting through the sidewall of the home, providing installation flexibility while maintaining safety standards. Additionally, the boilers are equipped with a Honeywell integrated control for precise temperature management and modulating gas valve technology, which adjusts the gas flow to match the heating demand, further optimizing fuel consumption.

Another defining characteristic of the GWB8 models is their durable construction. Designed to withstand the rigors of heating applications, these models feature a robust, powder-painted steel cabinet that helps prevent rusting and corrosion. The access doors are insulated, contributing to overall efficiency while allowing easy maintenance and serviceability.

The GWB8 series is also designed with homeowner comfort in mind. The quiet operation of these boilers ensures that they blend into the living environment without disruptive noise, making them an ideal choice for residential settings. The models are compatible with various heating systems, including hydronic heating, making them versatile and reliable.

Overall, Lennox's GWB8 Gas-Fired Hot Water Boiler series is an excellent choice for homeowners seeking efficient, durable, and reliable heating solutions. With a combination of advanced technologies, energy-efficient performance, and practical features, these boilers set a high standard for residential heating systems in today's market.
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