A.O. Smith GB/GW-500 Error Message Reported Error, Blocked Vent SHUT-OFF System, Burner System

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Troubleshooting

The WHC1502 Series Control System has many inherent diagnos- tic and fault detection routines built into its operating hardware and software. These routines, in conjunction with the four (4) digit LED display and eleven (11) LED status indicators on the Display Board, can greatly assist any service person in quickly pinpointing the source of a problem which may occur within the appliance. Under certain circumstances, multiple LED’s will illuminate to better pinpoint the target area(s).

The following list defines the error code messages that scroll across the LED display:

ERROR MESSAGE

REPORTED ERROR

OPEn InLEt ProbE

No probe detected at connec-

 

tor CN1 on Control Board.

OPEn OutLEt ProbE

No probe detected at connec-

 

tor CN2 on Control Board.

Circulation FAIL

No flow detected at flow

 

switch.

Inducor FAIL

No pressure detected at pres-

 

sure switch.

FLAmE SenSE FAIL

Flame sense detected before

 

gas valve is turned on.

SenSor FAIL

One of the sensors, Flow,

 

Pressure, Hi Gas, or Lo Gas

 

was not in the correct state.

Ignitor FAIL

No Ignitor current sensed.

No Ignition

Flame not detected after 1 or

 

3 tries.

ECO FAIL

ECO/High Limit switch

 

opened.

Control FAIL

Relay did not open or close

 

properly.

BLOCKED VENT SHUT-OFF SYSTEM

surrounding air pressure. Inspection of the boiler and vent system is necessary to insure that flue gas leakage to the surrounding area does not occur.

Inspect the external surfaces of the vent system every 3 months for corrosion and leakage. Inspect the vent terminations for corrosion and foreign matter which may be blocking the exhausting flue products. Call a qualified service agent to replace or repair any corroded or leaking parts.

Qualified service agent must inspect internal surfaces of the vent system and the boiler at least once a year.

BURNER SYSTEM

To maintain safe operation and the greatest efficiency for the boiler, observe the burner flame through the observation port on the left jacket panel, once a month for proper flame characteristics.

The burners should display the following characteristics:

Provide complete combustion of gas.

Cause rapid ignition and carry over across all burners and across the entire burner.

Give quiet operation during ignition, burning and extinction.

Cause no excessive lifting of flames from the burner ports.

If the preceding characteristics are not evident, check for accumulation of lint or other foreign material that restricts the inlet air or burner ports. Ensure there is the proper amount of air to the burner. Flame lifting from the burner is caused by too much air to the burner.

The burners must be inspected by a qualified service technician at least once a year.

DO NOT STORE COMBUSTIBLE MATERIALS, GASOLINE, OR OTHER FLAMMABLE VAPORS, LIQUIDS IN THE AREA OF THE APPLIANCE. NONCOMPLIANCE MAY RESULT IN FIRE OR EXPLOSION. DO NOT OBSTRUCT THE FLOW OF COM- BUSTION OR VENTILATION AIR TO THE APPLIANCE.

CHEMICAL VAPOR CORROSION

The Boiler is equipped with a blocked vent shut-off system which will close the gas valve and shut off the main burner gas when there is excessive pressure in the vent system due to a partially or completely blocked vent system. The DIA-SCAN II display on the front panel will indicate this failure condition.

DO NOT ATTEMPT TO OPERATE THE BOILER if this situation occurs. Shut the boiler off before performing all the steps shown in "TO TURN OFF GAS TO APPLIANCE" section of the Lighting and Operating Instructions.

Contact a qualified service agent to inspect the unit and vent system and correct the problem.

VENT SYSTEM

The flue products are corrosive in nature and if the boiler is vented horizontally the flue gases are at a higher pressure than the

Boiler corrosion and component failure can be caused by airborne chemical vapors. Spray can propellants, cleaning solvents, refrigerants, calcium or sodium chloride (water softener salts), waxes, and process chemicals are typical compounds that are potentially corrosive. These materials are corrosive at very low concentration levels with little or no odor to reveal their presence. Products of this sort should not be stored near the boiler. Air which is brought in contact with the boiler should not contain any of these chemicals. The boiler should be provided with air from outdoors when installed in environments having corrosive atmospheres.

CIRCULATION PUMP

Refer to the pump manufacturer's schedule of maintenance for frequency and method of lubricating the pump and motor. Inspect the pump once a month for leaky mechanical seals and/or O-rings and loose or damaged components. Contact a qualified service agent to replace or repair parts as required.

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Contents GAS-FIRED Commercial Lighting InstructionsLighting Instructions for the GB/W 200 through 500 models Lighting Instructions for the GB/W 650 and 750 models Line Polarity Indicator DIA-SCAN II Display Board Operating ProceduresOptions/Features Setting Procedures Fuse ProtectionRed Fault Lights Water Temperature Set LightsTemperature Set-point Adjustment Procedure Switching Differential Adjustment ProcedureDisplay Current Mode Tank Probe Installation ProcedureTank Probe Set-Point Adjustment Tank Probe Temperature Set-point Adjustment ProcedureTroubleshooting Ignition System Display Board LED IndicatorsLED Controller FunctionError Message Reported Error Blocked Vent SHUT-OFF SystemBurner System Chemical Vapor CorrosionPoint to Point Wiring Diagram NEW Boiler Limited Warranty

GB/GW-500, GB/GW-650, GB/GW-750, GB/GW-400, GB/GW-200 specifications

A.O. Smith is a renowned name in the water heating industry, offering a wide range of products that cater to various residential and commercial needs. Among their standout offerings are the GB/GW-200, GB/GW-400, GB/GW-650, GB/GW-750, and GB/GW-500 models. Each model is designed with advanced technologies, ensuring optimal performance, energy efficiency, and reliability.

The GB/GW-200 model, with a capacity of 200 liters, is ideal for small to medium-sized households. It features a high-efficiency gas burner and an advanced electronic control system that ensures accurate temperature regulation. The unit also comes equipped with a glass-lined tank for enhanced durability and resistance against corrosion, extending its lifespan significantly.

Moving up in capacity, the GB/GW-400 model offers 400 liters of hot water storage, making it a preferred choice for medium to large households or small businesses. One of its key features is the multiple safety systems integrated into its design, including flame failure protection and temperature control features, making it both safe and reliable. Additionally, this model is equipped with a user-friendly digital display that allows for easy monitoring and adjustments.

The GB/GW-500 model takes it a step further with a capacity of 500 liters. Designed for larger applications, including commercial settings, it integrates A.O. Smith’s innovative heating technology for rapid recovery rates. This model stands out with its focus on energy efficiency, having an impressive Energy Factor rating that significantly reduces operational costs.

The GB/GW-650 and GB/GW-750 models cater to even larger needs, featuring capacities of 650 and 750 liters respectively. Both models are engineered with high-output burners, ensuring quick heating even during peak demand periods. Advanced insulation materials are used, enhancing thermal efficiency and minimizing heat loss, which translates to significant energy savings over time.

All these models feature A.O. Smith’s proprietary tankless technology, which allows for continuous hot water supply without the need for a large storage tank. This innovation not only saves space but also addresses the ever-increasing demands for hot water in modern households and businesses.

In conclusion, the A.O. Smith GB/GW series—GB/GW-200, GB/GW-400, GB/GW-500, GB/GW-650, and GB/GW-750—delivers reliable, energy-efficient water heating solutions suited for a variety of applications. With advanced safety features, user-friendly controls, and high energy efficiency ratings, these models are built to meet the demands of any modern water heating application, ensuring customer satisfaction and peace of mind.