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American Water Heaters
Gas Water Heater

Model # N40S91-403 Official American Water Heaters water heater

Here are the diagrams and repair parts for Official American Water Heaters N40S91-403 water heater, as well as links to manuals and error code tables, if available.

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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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Owner’s manual
Error Codes

Model diagram and schematic

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ALL PARTS
Showing 10 of 14 parts  |
Water Heater Burner (replaces 3110024) 186063-000
#13A

Water heater diagram

Water heater burner (replaces 3110024)

Part #186063-000

BEST SELLER
$44.15 | 
12% OFF Phone Price : $50.15
In Stock
American Water Heater Water Heater Gas Valve And Temperature Control Assembly (replaces 100112336) 6911131
#10

Water heater diagram

American water heater water heater gas valve and temperature control assembly (replaces 100112336)

Part #6911131

$207.58 | 
5% OFF Phone Price : $219.58
In Stock
Drain Valve 6900820
#9

Water heater diagram

Drain valve

Part #6900820

Replaced by #100108269

?
Manufacturer substitution
This part replaces 6900820. Substitute parts can look different from the original.
$18.57
In Stock
Water Heater Pilot Assembly 6911143
#12

Water heater diagram

Water heater pilot assembly

Part #6911143

Replaced by #100112330

?
Manufacturer substitution
This part replaces 6911143. Substitute parts can look different from the original.
$96.67
In Stock
Water Heater Dip Tube 4710743
#6

Water heater diagram

Water heater dip tube

Part #4710743

Replaced by #100110924

?
Manufacturer substitution
This part replaces 4710743. Substitute parts can look different from the original.
$24.44
In Stock
Water Heater Temperature And Pressure Relief Valve 6900816
#8

Water heater diagram

Water heater temperature and pressure relief valve

Part #6900816

Replaced by #100108279

?
Manufacturer substitution
This part replaces 6900816. Substitute parts can look different from the original.
$32.22
In Stock
American Water Heaters Manifold Door And Burner Assembly 6911165
#14A

Water heater diagram

American water heaters manifold door and burner assembly

Part #6911165

Replaced by #100094002

?
Manufacturer substitution
This part replaces 6911165. Substitute parts can look different from the original.
$181.00
In Stock
Anode Rod 4700375
#7

Water heater diagram

Anode rod

Part #4700375

Replaced by #100108571

?
Manufacturer substitution
This part replaces 4700375. Substitute parts can look different from the original.
$90.00
In Stock
Draft Hood 185917-003
#1

Water heater diagram

Draft hood

Part #185917-003

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

Outer Door 321345-000
#11

Water heater diagram

Outer door

Part #321345-000

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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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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How to read a wiring schematic video

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Water heater common questions

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