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A.O. Smith GPDH - User Manual

A.O. Smith GPDH
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1
PART NO. 184707-001
GPDH/GPDT/GPDX
GAS MODELS
with
Hot Surface Ignition
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY.
PLEASE READ
THOROUGHLY BEFORE INSTALLING AND USING THIS
APPLIANCE.
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
PRINTED IN U.S.A. 0805
Thank you for buying this energy efficient water heater from
A.O. Smith Water Products Company. We appreciate your
confidence in our products.
You should thoroughly read this manual before installation and/
or operation of this water heater. Please pay particular attention
to the important safety and operating instructions as well as the
WARNINGS and CAUTIONS.
A DIVISION OF A.O. SMITH CORPORATION
www.aosmithwaterheaters.com
GET TO KNOW YOUR WATER HEATER ......................2
GENERAL SAFETY INFORMATION .............................3
INSTALLATION ....................................................... 3-11
LIGHTING AND OPERATING LABEL ......................... 12
OPERATION .......................................................... 13-14
MAINTENANCE AND
TROUBLESHOOTING ........................................... 14-18
WARRANTY................................................................ 19
TABLE OF CONTENTS
PAGE
OWNER'S MANUAL
GAS WATER HEATER
RESIDENTIAL

Table of Contents

Questions and Answers

  • K
    kimberlyblackwellNov 21, 2025
    Why A.O. Smith Water Heater has no hot water?
    • M
      Michele WattsNov 21, 2025
      There could be several reasons why your A.O. Smith water heater isn't producing enough hot water. Here are a few possible causes and solutions: * The “ON/OFF” control switch might be turned off. If so, turn the switch to the “ON” position. * The blower might be unplugged. In this case, plug the blower back into the 115 Vac outlet. * There might be no power at the outlet. If this is the case, repair service to the outlet. * The thermostat might be defective, requiring replacement. * The control harness could be defective, also requiring replacement. * The high limit control circuit might be open. Replace the ECO. * The blower motor might be defective. Replace the Blower Assembly. Other potential issues include the thermostat being set too low (set the temperature control hig...
  • W
    Willie GallegosAug 25, 2025
    How to fix water leaks from A.O. Smith GPDH Water Heater?
    • S
      Stephen TrevinoAug 26, 2025
      If you notice water leaks from your A.O. Smith water heater, consider these possible causes and solutions: * Improperly sealed connections at the hot or cold supply, relief valve, drain valve, or thermostat threads. Try tightening these threaded connections. * Leaks from nearby appliances or water lines. Inspect other appliances in the vicinity of the water heater. * Condensation of flue products. Refer to the “CONDENSATION” section.
  • P
    Philip LeeAug 27, 2025
    Why A.O. Smith GPDH Water Heater lights but goes out quickly?
    • D
      daniellebrooksAug 27, 2025
      If your A.O. Smith water heater lights but goes out in 4-5 seconds, the outlet polarity may be reversed. Test the polarity and correct it.
  • S
    Sarah Manning MDAug 27, 2025
    Why my A.O. Smith GPDH sounds sizzling or rumbling?
    • C
      Carrie ChoiAug 27, 2025
      Sizzling or rumbling sounds coming from your A.O. Smith water heater can be caused by: * Condensation dripping on the burner. Refer to the CONDENSATION section. * Sediment buildup at the bottom of the tank. Clean the sediment from the tank. Refer to the DRAINING instruction in the Maintenance section of the manual.
  • D
    David HallAug 29, 2025
    What causes A.O. Smith GPDH Water Heater vent pipe to be too hot?
    • C
      christophertorresAug 29, 2025
      A vent pipe that is too hot (above 170°F) on your A.O. Smith water heater may be due to: * A defective air flow restrictor. Immediately take the unit out of service and call an A.O. Smith service representative. * Insufficient dilution air mixing with flue gases in the inlet tee. Ensure proper dilution air is provided for combustion and flue temperature dilution. Refer to the “INSTALLATION” section. * Dilution air that is too hot for mixing with flue gases. Check for heat sources around the intake terminal and any blockage of the dilution air leg, as the supply air may be too hot. * The wrong burner orifice. Install the correct orifice.
  • C
    Cesar GonzalezSep 23, 2025
    What to do if temperature adjust button stuck closed in A.O. Smith GPDH?
    • J
      James SchmidtSep 23, 2025
      If one of the temperature adjust buttons is stuck closed on your A.O. Smith water heater: * Press and release each of the buttons once. * Replace the gas control valve.
  • D
    Douglas BoydSep 16, 2025
    What to do if flame signal sensed out of proper sequence in A.O. Smith GPDH?
    • P
      Pamela Moore MDSep 16, 2025
      If the flame signal is sensed out of proper sequence in your A.O. Smith water heater, replace the gas control valve.
  • S
    Samantha CampbellSep 18, 2025
    What to do if ECO activated in A.O. Smith Water Heater?
    • R
      rcomptonSep 18, 2025
      If the ECO (Emergency Cut Off) is activated in your A.O. Smith water heater, replace the gas control valve.
  • A
    Ann LewisSep 8, 2025
    What to do if there is a wiring error or a high resistance to earth ground in A.O. Smith GPDH Water Heater?
    • D
      Daniel MarshallSep 8, 2025
      If you encounter a wiring error or high resistance to earth ground with your A.O. Smith water heater: * Check for proper connection of line neutral and hot wires. * Ensure the water heater is securely connected to earth ground.
  • K
    Kenneth DunnSep 5, 2025
    How to fix error in the hot surface igniter circuit of A.O. Smith GPDH?
    • C
      Christina MaciasSep 5, 2025
      To address an error in the hot surface igniter circuit of your A.O. Smith water heater: * Check that all wiring is correct and secure. * Replace the hot surface igniter.

Summary

Get to Know Your Water Heater

Replacement Parts and Deliming Products

Information on ordering replacement parts and recommended delimer products.

General Safety Information

External Damage

Safety precautions regarding external damage to the water heater.

Chemical Vapor Corrosion

Warning about corrosion from chemical vapors affecting combustion and vent systems.

Extended Non-Use Periods

Safety advice for periods of inactivity, including hydrogen gas risks.

Insulation Blankets

Statement that insulation blankets are not necessary for A.O. Smith products.

Liquid Petroleum Models

Specific safety warnings and instructions for propane or LP gas models.

Required Ability

Specifies the qualified tradesman skills needed for installation.

Closed Water System

Explanation of closed water systems and potential issues like thermal expansion.

Relief Valve (P)

Details on the temperature and pressure relief valve installation and requirements.

Installation

General

General installation requirements and code compliance.

Location of Heater

Guidance on selecting a safe and appropriate location for the water heater.

Water Connections

Instructions for connecting water supply lines to the heater.

Gas Connections

Instructions and warnings for connecting the gas supply to the heater.

Venting

Combustion Air and Exhaust

Information regarding air supply and exhaust requirements for combustion.

Venting Through an Outside Wall - Clearances

Clearances required for venting the unit through an outside wall.

Operation

Before Operating

Pre-operation checks including water filling and gas smell.

Operating Instructions

Step-by-step guide for safely lighting and operating the water heater.

To Turn Off Gas to Appliance

Procedure for safely shutting off the gas supply to the appliance.

Water Heating Ignition Sequence

Control Sequence - Hot Surface Direct Ignition

Detailed sequence of operations for the hot surface ignition system.

High Altitude Installation

Specific requirements for installing the heater at high altitudes.

Venting Manual Reset Switch

Information on the manual reset switch for the venting system.

Maintenance

Main Burner

Procedure for checking and cleaning the main burner for optimal performance.

High Temperature Limit Switch

Explanation of the built-in limit switch and its function.

Venting System

Routine inspection requirements for the venting system.

Power Venter Maintenance

Annual inspection requirements for the power venter motor.

T & P Valve

Annual check to ensure the temperature and pressure relief valve is functioning.

Draining

Instructions for draining the water heater to prevent freezing damage.

Condensation

Explanation of common condensation issues and their causes.

Cathodic Protection - Anode

Information on the anode rod's role in corrosion protection and maintenance.

Service and Repair

Trouble Shooting Help

Guidance for diagnosing and resolving common water heater problems.

Thermostat and Gas Supply Check

Procedure to check thermostat operation and gas supply pressure.

Trouble Shooting (Continued)

Water Heater Control

Troubleshooting common issues indicated by the water heater control system's LEDs.

Limited Residential Gas Warranty

Conditions and Exceptions

Specific conditions and exceptions that apply to the water heater warranty.

Service and Labor Responsibility

Clarification of warranty coverage for service and labor costs.

Limitation on Implied Warranties

Details on the duration and limitations of implied warranties.

Claim Procedure

Steps to follow when initiating a warranty claim.

Disclaimers

Legal disclaimers regarding the extent of the manufacturer's liability.

Important Information

Fields for recording essential information for warranty purposes.

A.O. Smith GPDH Specifications

General IconGeneral
BrandA.O. Smith
ModelGPDH
CategoryWater Heater
LanguageEnglish

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