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AO Smith
Gas Water Heater

Model # GPDH40100 Official AO Smith water heater

Here are the diagrams and repair parts for Official AO Smith GPDH40100 water heater, as well as links to manuals and error code tables, if available.

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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Error Codes

Model diagram and schematic

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ALL PARTS
Showing 10 of 43 parts  |
Dip Tube 183900-020
#13

Water heater diagram

Dip tube

Part #183900-020

Replaced by #9003662005

?
Manufacturer substitution
This part replaces 183900-020. Substitute parts can look different from the original.
$17.49
In Stock
Temperature Valve 043151-000
#12

Water heater diagram

Temperature valve

Part #043151-000

The manufacturer no longer makes this part, and there's no substitute part

Anode Rod 183523-026
#14

Water heater diagram

Anode rod

Part #183523-026

Replaced by #100109624

?
Manufacturer substitution
This part replaces 183523-026. Substitute parts can look different from the original.
$31.11
In Stock
Nipple 184633-002
#NI

Water heater diagram

Nipple

Part #184633-002

Replaced by #100108409

?
Manufacturer substitution
This part replaces 184633-002. Substitute parts can look different from the original.
$25.71
In Stock
Thermostat 184768-005
#27A

Water heater diagram

Thermostat

Part #184768-005

The manufacturer no longer makes this part, and there's no substitute part

Door Clip 0002400720
#25A

Water heater diagram

Door clip

Part #0002400720

The manufacturer no longer makes this part, and there's no substitute part

Baffle 0015143460
#32

Water heater diagram

Baffle

Part #0015143460

The manufacturer no longer makes this part, and there's no substitute part

Door 0015123490
#23

Water heater diagram

Door

Part #0015123490

The manufacturer no longer makes this part, and there's no substitute part

Door 0015123500
#24

Water heater diagram

Door

Part #0015123500

The manufacturer no longer makes this part, and there's no substitute part

Jacket/access Door Clips 0002400801
#25B

Water heater diagram

Jacket/access door clips

Part #0002400801

The manufacturer no longer makes this part, and there's no substitute part

Most common symptoms to help you fix your water heaters

Choose a symptom to see related water heater repairs.

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Why isn't my water heater heating my water?

Main causes: lack of power, no gas supply, thermostat limit switch tripped, bad element, bad thermostat, gas valve failu…

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Why isn't my water heater making the water hot enough?

Main causes: thermostats need adjustment, water heater capacity too low, bad heating element, thermostat failure, excess…

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Why is there water in my water heater's drain pan?

Main causes: loose water pipe fittings, leaky drain valve, bad temperature-pressure relief valve, leaky heating element,…

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Why does my hot water smell like rotten eggs?

Main causes: water supply needs chlorine treatment, anode rod too reactive…

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Why isn't my water heater making enough hot water?

Main causes: broken heating element, thermostat failure, excessive tank sediment, tank size too small, burner valve asse…

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Why is my water heater making the water too hot?

Main causes: thermostat temperature set too high, thermostats need adjustment, faulty thermostat, shorted heating elemen…

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Why is my water heater's pressure relief valve dripping water?

Main causes: faulty pressure relief valve, water is overheating…

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Effective articles & videos to help repair your water heaters

Use the advice and tips in these articles and videos to get the most out of your water heater.

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Wiring schematic symbols explained video

Wiring schematic symbols explained video

Learn some of the most common symbols found in a wiring diagram and what they mean.…

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Using a wiring schematic to trace a current video

Using a wiring schematic to trace a current video

Find out what’s wrong with your appliance by following a circuit.…

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Easy DIY water heater repairs

Easy DIY water heater repairs

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