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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
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
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
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

Gasket 0005301040
#8

Water heater diagram

Gasket

Part #0005301040

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

Ac Cord 181345-000
#28

Water heater diagram

Ac cord

Part #181345-000

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

Thermostat 184768-005
#27A

Water heater diagram

Thermostat

Part #184768-005

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

Burner 184343-000
#19

Water heater diagram

Burner

Part #184343-000

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

Adapter 196055-000
#33C

Water heater diagram

Adapter

Part #196055-000

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

Door 0003901050
#20

Water heater diagram

Door

Part #0003901050

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

Most common symptoms to help you fix your water heaters

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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 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's pressure relief valve dripping water?

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

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

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