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AO Smith
Gas Water Heater

Model # FCV40 Official AO Smith water heater

Here are the diagrams and repair parts for Official AO Smith FCV40 water heater, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

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  • In the search box below, enter all or part of the part number or the part’s name.

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

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For DIY troubleshooting advice and repair guides, visit our repair help section.

Error Codes

Model diagram and schematic

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ALL PARTS
Showing 10 of 33 parts  |
Gas Valve 182792
#13A

Water heater diagram

Gas valve

Part #182792

Replaced by #9003408005

?
Manufacturer substitution
This part replaces 182792. Substitute parts can look different from the original.
$277.19 | 
$12.00 OFF Phone Price : $289.19
In Stock
Anode Rod 183523-26
#18

Water heater diagram

Anode rod

Part #183523-26

Replaced by #100109624

?
Manufacturer substitution
This part replaces 183523-26. Substitute parts can look different from the original.
$31.11
In Stock
Drain Pan 23913-A
#25A

Water heater diagram

Drain pan

Part #23913-A

Replaced by #100108616

?
Manufacturer substitution
This part replaces 23913-A. Substitute parts can look different from the original.
$64.44
In Stock
Orifice 181791-51-FV
#3A

Water heater diagram

Orifice

Part #181791-51-FV

Replaced by #100109241

?
Manufacturer substitution
This part replaces 181791-51-FV. Substitute parts can look different from the original.
$31.11
In Stock
Drain Pan 23914-A
#25B

Water heater diagram

Drain pan

Part #23914-A

Replaced by #100108615

?
Manufacturer substitution
This part replaces 23914-A. Substitute parts can look different from the original.
$92.22
In Stock
Drain Pan 23912-A
#25

Water heater diagram

Drain pan

Part #23912-A

Replaced by #100108459

?
Manufacturer substitution
This part replaces 23912-A. Substitute parts can look different from the original.
$63.33
In Stock
View Port 21253
#20

Water heater diagram

View port

Part #21253

Replaced by #100109224

?
Manufacturer substitution
This part replaces 21253. Substitute parts can look different from the original.
$34.44
In Stock
Igniter 183798
#17

Water heater diagram

Igniter

Part #183798

Replaced by #100109221

?
Manufacturer substitution
This part replaces 183798. Substitute parts can look different from the original.
$25.71
In Stock
Burner 183504-FV
#2

Water heater diagram

Burner

Part #183504-FV

Replaced by #100109206

?
Manufacturer substitution
This part replaces 183504-FV. Substitute parts can look different from the original.
$45.56
In Stock
Glass View 183568-000
#22

Water heater diagram

Glass view

Part #183568-000

Replaced by #100109224

?
Manufacturer substitution
This part replaces 183568-000. Substitute parts can look different from the original.
$34.44
In Stock

Most common symptoms to help you fix your water heaters

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Why isn't my water heater heating my water?

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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?

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Effective articles & videos to help repair your water heaters

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Wiring schematic symbols explained video

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