A.O. Smith GPDT, GPDX, GPDH Trouble Shooting, Water Heater Control LED Status Problem Solution

Page 17

WARNING: DO NOT BY-PASS ANY CONTROLS TO MAKE HEATER OPERATE.

OPERATE ONLYAS WIRED FROM FACTORY.

TROUBLE SHOOTING

Please check guidelines below. For your safety, water heater service should be performed only by a qualified service technician.

Read the GENERAL SAFETY INFORMATION section first.

WATER HEATER CONTROL

LED STATUS

PROBLEM

 

SOLUTION

 

An open earth ground circuit to the

1. Check that the earth ground connection is

A B C

ignition system.

 

properly connected.

 

 

2.

Check that the ground conductor on the

 

 

 

water heater is properly connected.

A B C

Wiring error or a high resistance to

1.

Check for proper connection of line

earth ground.

 

neutral and hot wires.

 

 

 

 

2.

Check that the water heater is securely

 

 

 

connected to earth ground.

A B C

Pressure switch remained closed longer

1.

Pressure switch wiring is incorrect.

than 5 seconds after the call for

2.

Replace pressure switch.

 

 

heat began.

 

 

A B C

Pressure switch remained open longer

1.

Pressure switch wiring is incorrect.

than 5 seconds after the combustion

2.

Pressure switch tubing not connected

 

 

blower was energized.

 

correctly.

 

 

3.

Air intake or exhaust obstructed.

A B C

Error in the hot surface igniter circuit.

1.

Check that all wiring is correct and secure.

 

 

2.

Replace hot surface igniter.

 

System in lockout.

1.

Gas supply is off or too low to operate.

A B C

 

2.

Hot surface igniter not positioned

 

 

correctly.

 

 

 

 

 

3.

Low voltage to the water heater.

 

 

4.

Electric polarity to unit is incorrect - test

 

 

 

and correct.

A B C

Problem in the gas valve driver circuit.

1.

Turn power to the water heater off for

 

 

 

10 seconds and the back on.

 

 

2.

Replace gas control valve.

A B C

Problem with the internal circuit.

1.

Turn power to the water heater off for

 

 

10 seconds and then back on.

 

 

 

 

 

2.

Replace gas control valve.

A B C

Problem with the internal circuit.

1.

Turn power to the water heater off for

 

 

 

10 seconds and then back on.

 

 

2.

Replace gas control valve.

A B C

Flame signal sensed out of

1.

Replace gas control valve.

 

proper sequence.

 

 

A B C

ECO activated.

1.

Replace gas control valve.

A B C

One of the temperature adjust

1.

Press and release each of the buttons

 

buttons stuck closed.

 

once.

 

 

2.

Replace gas control valve.

A B C

Water temperature sensor is

1.

Check that all wiring is correct and secure.

 

either open or short circuited.

2.

Replace gas control valve.

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Contents Residential GAS Model Replacement Parts and Deliming ProductsWith HOT Surface Ignition Chemical Vapor Corrosion External DamageExtended NON-USE Periods Insulation BlanketsWater Potable Heating Space Heating Location of HeaterWater Connections Venting Closed Water SystemGAS Connections Venting Through an Outside Wall Clearances Combustion AIR and ExhaustVenting Through Roof Clearances Wire FenceVenting Through AN Outside Wall DIA. Vents Number of 90 DEG Venting System Example Installation For ALL ModelsVent piping can be installed as follows Vent Pipe Separation Approximate Setting Time for 2-1/2 to 4 Pipe JointsCementing PVC, ABS or Cpvc Pipe and Fittings Movement Complete Joint SETConnecting Vent to Blower WiringVenting Through a Roof ElbowsOptional Field Installed Wiring Do not TRY to Light the Burner by Hand What to do if YOU Smell GASFilling Temperature RegulationVenting Manual Reset Switch High Altitude InstallationWater Heating Ignition Sequence Control Sequence HOT Surface Direct IgnitionPower Venter Maintenance High Temperature Limit SwitchMain Burner Venting SystemThermostat and GAS Supply Check Service and RepairWater Heater Control LED Status Problem Solution Trouble ShootingVent Pipe TOO HOT HOT WaterYellow Flame CondensationLimited Residential GAS Warranty Southeast Parkway FRANKLIN, TN

GPDT, GPDH, GPDX specifications

A.O. Smith is a renowned leader in the manufacturing of water heating solutions, and its series of gas water heaters, including the GPDT, GPDH, and GPDX models, are emblematic of the company’s commitment to innovation, efficiency, and reliability.

The A.O. Smith GPDT series is characterized by its high energy efficiency and robust design. With a 40-gallon capacity, it utilizes a 0.67 energy factor, making it an ideal choice for both residential and light commercial applications. This model features a unique combustion system that minimizes emissions while maximizing hot water output. Equipped with a powered draft system, the GPDT series effectively vents combustion gases, improving air quality and lowering operational costs.

In contrast, the GPDH series is particularly notable for its compatibility with high-efficiency gas appliances. It employs a direct vent system, allowing for versatile installation options. The GPDH models also include advanced diagnostics and a LED display that simplifies monitoring and maintenance. With an enhanced insulation design, these heaters minimize heat loss, effectively optimizing performance and energy savings.

The GPDX series capitalizes on cutting-edge technologies to provide superior performance. With capacities ranging from 30 to 50 gallons, these water heaters are designed to meet varying needs. The GPDX is equipped with a dual-purpose valve that offers superior temperature control and safety features, ensuring user convenience and peace of mind. Its intuitive interface allows users to easily set their desired water temperature and monitor performance metrics.

One of the key characteristics that unify the GPDT, GPDH, and GPDX models is their commitment to durability. A.O. Smith incorporates high-quality materials and innovative engineering processes to enhance the longevity of their products. Each model features an impressive warranty, demonstrating the company’s confidence in their craftsmanship.

In conclusion, A.O. Smith's GPDT, GPDH, and GPDX gas water heater series offer a blend of efficiency, performance, and innovation. These models are equipped with advanced technologies designed to provide users with reliable hot water solutions while minimizing energy consumption. With their robust build, user-friendly features, and impressive warranties, A.O. Smith continues to be a top choice for those seeking dependable gas water heating solutions.
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