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A.O. Smith GCVT-40 - User Manual

A.O. Smith GCVT-40
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Instruction Manual
PRINTED IN THE U.S.A 0905 PART NO. 184165-003
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
NOT FOR USE IN MANUFACTURED (MOBILE) HOMES
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS
PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE WRITE TO THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.
RESIDENTIAL GAS WRESIDENTIAL GAS W
RESIDENTIAL GAS WRESIDENTIAL GAS W
RESIDENTIAL GAS W
AA
AA
A
TER HEATER HEA
TER HEATER HEA
TER HEA
TERSTERS
TERSTERS
TERS
For Your Safety
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
C3 Technology
®
Gas Water Heaters meet the new
ANSI Z21.10.1 standard that deals with the accidental or
unintended ignition of flammable vapors, such as those
emitted by gasoline.
GAMA certification applies to
all residential gas water
heaters with capacities of 20
to 100 gallons with input rating
of 75,000 BTU/Hr. or less.
®

Questions and Answers

  • W
    William PollardAug 14, 2025
    What to do if A.O. Smith GCVT-40 Water Heater is leaking?
    • E
      Eric TurnerAug 14, 2025
      If you notice water leaks from your A.O. Smith Water Heater, first, check all threaded connections such as hot or cold supply connections, the relief valve, drain valve, or thermostat threads. Tighten any connections that seem loose. Also, inspect other appliances and water lines near the water heater for any leakage.
  • J
    Jordan HornAug 17, 2025
    Why A.O. Smith Water Heater burner will not stay lit?
    • J
      James MontgomeryAug 17, 2025
      If the burner on your A.O. Smith Water Heater won't stay lit, it could be due to several reasons. A defective thermocouple TCO might be the cause, requiring replacement of the pilot assembly. Alternatively, high ambient room temperature or a dirty/clogged air intake screen could be the issue. Try cleaning and reinstalling the air intake screen. If the flame arrestor openings are blocked or the gas control is defective, it's recommended to contact a service agency or replace the gas control, respectively.
  • C
    carriemcclureAug 20, 2025
    How to fix A.O. Smith Water Heater pilot that will not light?
    • D
      Dennis RayAug 21, 2025
      If the pilot light of your A.O. Smith Water Heater won't light, ensure the main gas supply is turned on and check that the gas control knob is correctly positioned. Adjust the igniter tip if it's more than 1/8" from the pilot hood. Other potential causes include a thermocouple malfunction, a broken electrode or electrical wire, or a malfunctioning Piezo Ignitor generator. In such cases, replacing the pilot assembly or Piezo Ignitor generator may be necessary. Also, reconnect the wire connector to the spark ignitor if it is disconnected.
  • R
    Roberta MortonAug 25, 2025
    What to do if A.O. Smith GCVT-40 Water Heater T&P valve is leaking?
    • M
      Michael BarrettAug 25, 2025
      If your A.O. Smith Water Heater's T&P valve is leaking, it might be due to thermal expansion in a closed water system. In this case, install a thermal expansion tank. Also, check the relief valve for proper operation, ensuring it's correctly seated.
  • C
    Christina JacobsonAug 27, 2025
    Why does the pilot light keep going out on my A.O. Smith GCVT-40?
    • B
      brett72Aug 27, 2025
      If the pilot light on your A.O. Smith Water Heater keeps going out, it might be due to a dirty pilot burner. Try cleaning the pilot assembly. Also, check the air intake screen and clean and reinstall it if it's dirty or clogged. Ensure the thermocouple tip is correctly positioned in contact with the pilot flame. If these steps don't resolve the issue, the thermocouple itself may be malfunctioning and need replacement.
  • B
    Brandon ParkerAug 30, 2025
    Why is my A.O. Smith GCVT-40 Water Heater not producing enough hot water?
    • C
      Christopher DavisAug 30, 2025
      If your A.O. Smith Water Heater is not providing enough hot water, first check if the heater is lit and the thermostat is on. If not, consult the lighting instructions. If the thermostat is set too low, adjust it according to the temperature regulation guidelines. If the heater is undersized, reduce your hot water usage. Also, consider that unusually cold incoming water will require more time for the heater to reheat, and leaking hot water pipes or fixtures should be checked and repaired by a plumber.
  • A
    andreahillSep 3, 2025
    Why is the water from my A.O. Smith GCVT-40 too hot?
    • P
      Patrick BrownSep 3, 2025
      If the water from your A.O. Smith Water Heater is too hot, it's likely that the thermostat is set too high. Refer to the temperature regulation guidelines to adjust it to a more comfortable and safe setting.
  • J
    joan17Sep 6, 2025
    Why does my A.O. Smith GCVT-40 have smelly odors?
    • C
      chenchristinaSep 6, 2025
      If you notice smelly odors coming from your A.O. Smith Water Heater, it could be due to high sulfate or mineral content in the water supply. To resolve this, drain and flush the heater thoroughly, then refill it. Another possible cause is bacteria in the water supply, in which case you should chlorinate or aerate the water supply.
  • A
    Ann WarrenSep 9, 2025
    Why A.O. Smith GCVT-40 is sizzling and rumbling?
    • C
      Caroline StevensonSep 9, 2025
      If your A.O. Smith Water Heater is making sizzling or rumbling sounds, it is likely due to sediment or calcium buildup in the bottom of the tank. To resolve this, clean the sediment from the tank following the draining instructions in the Maintenance section of the manual.

Summary

General Safety

Fire Hazard Warning

Precautions against fire risks, including floor type and flood damage.

Scald Injury Hazard Warning

Warns about severe burns from hot water and risks to vulnerable groups.

Explosion Hazard Warning

Risks of water tank explosion due to overheating or pressure.

Fire or Explosion Hazard Warning

Hazards related to flammable vapors, gas pressure, and ignition sources.

Carbon Monoxide Gas Hazard Warning

Dangers of carbon monoxide from improper venting or combustion.

Typical Installation

Locating the New Water Heater

Fire Hazard from Flammable Vapors

Warnings about storing or using flammable liquids near the appliance.

Combustion Air and Ventilation for Appliances Located in Confined Spaces

Installing the New Water Heater

Temperature-Pressure Relief Valve

Details on the T&P valve, its function, and installation requirements.

Venting

Guidelines for proper venting of combustion gases to the outdoors.

Gas Piping

Fire and Explosion Hazard (Gas)

Warnings about gas type, pressure, and leak testing.

For Your Safety Read Before Lighting

What to Do If You Smell Gas

Emergency procedures to follow if a gas leak is detected.

Lighting Instructions

Step-by-step guide for safely lighting the pilot and main burner.

Temperature Regulation

Hotter Water Can Scald

Risks of scald injuries from hot water and precautions for vulnerable users.

Operational Conditions

Hydrogen Gas Hazard

Warning about flammable hydrogen gas production in unused systems.

Periodic Maintenance

Temperature-Pressure Relief Valve Operation

How to test and operate the T&P relief valve.

Troubleshooting Guidelines

Pilot Will Not Light

Troubleshooting steps when the pilot light fails to ignite.

A.O. Smith GCVT-40 Specifications

General IconGeneral
ModelGCVT-40
TypeGas Water Heater
Capacity40 gallons
Energy Factor0.62
Warranty6 years
Fuel TypeNatural Gas
Vent TypeAtmospheric Vent
First Hour Rating67 Gallons
Gas TypeNatural Gas
BTU40, 000 BTU/hr

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