TROUBLE SHOOTING (Continued)

PROBLEM

CAUSE

SOLUTION

 

 

 

 

1) Blower will not run.

 

 

 

 

 

A) “ON/OFF” control switch turned off.

Turn switch to the “ON” position.

 

 

 

 

B) Blower unplugged.

Plug blower back into 115 Vac. outlet.

 

 

 

 

C) No power at outlet.

Repair service to outlet.

 

 

 

 

D) Thermostat defective.

Replace thermostat.

 

 

 

 

E) Control harness defective.

Replace control harness.

NOTENOUGH

 

 

F) High limit control circuit open.

Replace ECO.

 

 

G) Blower motor defective.

Replace Blower Assembly.

HOT WATER

 

 

Thermostat problems.

 

 

 

 

 

A) Thermostat set too low.

Set temperature control higher.

 

 

 

 

B) Thermostat or ECO defective.

Replace thermostat or ECO as required.

 

 

 

 

Others

 

 

 

 

 

A) Heater undersized.

Reduce hot water use.

 

 

 

 

B) Low gas pressure.

Contact dealer.

 

 

 

 

C) Incoming water is unusually cold.

Allow more time for heater to reheat.

 

 

 

 

D) Leaking hot water pipes or fixtures.

Have plumber check and repair leaks.

 

 

 

 

A) Defective air flow restrictor.

Take unit out of service immediately, call an

 

 

 

 

 

A.O. Smith service representative.

 

 

 

 

B) Not enough dilution air to mix with

Proper dilution air must be provided for

 

 

 

 

flue gases in inlet tee.

combustion and dilution of flue temp.

VENT PIPE TOO HOT

 

Refer to “INSTALLATION” section.

(ABOVE 170°F)

 

C) Dilution air too hot for mixing with

Supply air is too hot. Check for heat sources

 

 

 

 

flue gases.

around intake terminal and blockage of

 

 

 

 

 

dilution air leg.

 

 

 

 

D) Wrong burner orifice.

Install correct orifice.

 

 

 

 

A) Dirt in burner ports

Turn off heater and gas, clean burner head.

 

 

 

 

B) Combustion air path restricted.

Check intake venting arrangements for

YELLOW FLAME

 

obstructions.

 

 

 

 

C) Not enough dilution air for proper

Check Intake venting arrangement for

 

 

 

 

combustion.

obstructions.

 

 

 

 

A) Water on the floor under heater.

See “CONDENSATION” section.

CONDENSATION

 

B) Water dripping from pan.

Provide drip “TEE” to catch condensation,

 

 

 

 

 

see Figure 1.

 

 

 

 

Improperly sealed, hot or cold supply

 

 

 

 

 

connections, relief valve, drain valve

Tighten threaded connections.

WATER LEAKS

or thermostat threads.

 

 

 

 

 

Leakage from other appliances or water

Inspect other appliances near water heater.

 

 

 

 

lines.

 

 

 

 

 

Condensation of flue products.

Refer to “CONDENSATION” section.

 

 

 

 

Thermal expansion in closed water

Install thermal expansion tank (DO NOT plug

LEAKING T&P

system.

T&P valve).

 

 

 

 

Improperly seated valve.

Check relief valve for proper operation

 

 

 

 

 

(DO NOT plug T&P valve).

HOT WATER ODORS

High sulfate or mineral content in

Drain and flush heater thoroughly then refill.

(Refer to CATHODIC

water supply.

 

PROTECTION)

Bacteria in water supply.

Chlorinate water supply.

WATER TOO HOT

Thermostat set too high.

Refer to TEMPERATURE REGULATION.

WATER HEATER SOUNDS

Condensation dripping on burner.

Refer to CONDENSATION above.

SIZZLING-RUMBLING

Sediment at bottom of heater tank.

Clean sediment from tank. Refer to DRAINING

 

 

 

 

 

instruction in Maintenance section of manual.

SOOTING

Improper combustion.

Refer to COMBUSTION AIR AND EXHAUST on

 

 

 

 

 

page 6.

HEATER LIGHTS BUT GOES

Outlet polarity is reversed.

Test polarity and correct.

OUT IN 4-5 SECONDS

 

 

18

Page 17 Page 19
Page 18
Image 18
A.O. Smith GPDX, GPDH HOT Water, Vent Pipe TOO HOT, Yellow Flame, Condensation, Leaking T&P, Protection, Sizzling-Rumbling
Page 17 Page 19

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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