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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  |
Pilot Assembly 183824-172
#5A

Water heater diagram

Pilot assembly

Part #183824-172

Replaced by #100109253

?
Manufacturer substitution
This part replaces 183824-172. Substitute parts can look different from the original.
$140.00
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
Release Valve 76527-5
#19

Water heater diagram

Release valve

Part #76527-5

Replaced by #100108279

?
Manufacturer substitution
This part replaces 76527-5. Substitute parts can look different from the original.
$32.22
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
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
Flue Baffle 039331-053
#8

Water heater diagram

Flue baffle

Part #039331-053

Replaced by #9003649005

?
Manufacturer substitution
This part replaces 039331-053. Substitute parts can look different from the original.
$40.99
In Stock
Orifice 181508-33-FV
#3

Water heater diagram

Orifice

Part #181508-33-FV

Replaced by #100109266

?
Manufacturer substitution
This part replaces 181508-33-FV. Substitute parts can look different from the original.
$28.89
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
Burner 183222-26
#1

Water heater diagram

Burner

Part #183222-26

Replaced by #100109316

?
Manufacturer substitution
This part replaces 183222-26. Substitute parts can look different from the original.
$186.36
In Stock
Insulation 183162
#2A

Water heater diagram

Insulation

Part #183162

Replaced by #100109214

?
Manufacturer substitution
This part replaces 183162. Substitute parts can look different from the original.
$31.11
In Stock

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