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AO Smith
Gas Water Heater

Model # GCVL40 Official AO Smith water heater

Here are the diagrams and repair parts for Official AO Smith GCVL40 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:

  • Click a diagram to see the parts shown on that diagram.
  • 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 35 parts  |
Natural Gas Orifice 181508-033
#5

Water heater diagram

Natural gas orifice

Part #181508-033

Replaced by #100109266

?
Manufacturer substitution
This part replaces 181508-033. Substitute parts can look different from the original.
$28.89
In Stock
Burner Tube 183163-003
#6

Water heater diagram

Burner tube

Part #183163-003

Replaced by #100109207

?
Manufacturer substitution
This part replaces 183163-003. Substitute parts can look different from the original.
$71.11
In Stock
Drain Pan 23912-A
#26

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
Shield 191259-001
#24

Water heater diagram

Shield

Part #191259-001

Replaced by #9003696005

?
Manufacturer substitution
This part replaces 191259-001. Substitute parts can look different from the original.
$77.79 | 
7% OFF Phone Price : $83.79
In Stock
Pilot Assembly 183824-202
#19A

Water heater diagram

Pilot assembly

Part #183824-202

Replaced by #100109298

?
Manufacturer substitution
This part replaces 183824-202. Substitute parts can look different from the original.
$139.00
In Stock
Burner Head 183325-000
#4A

Water heater diagram

Burner head

Part #183325-000

Replaced by #9003631005

?
Manufacturer substitution
This part replaces 183325-000. Substitute parts can look different from the original.
$46.79 | 
11% OFF Phone Price : $52.79
In Stock
Burner 183222-012
#3

Water heater diagram

Burner

Part #183222-012

Replaced by #100109200

?
Manufacturer substitution
This part replaces 183222-012. Substitute parts can look different from the original.
$197.00
In Stock
Burner Tube 183450-003
#6A

Water heater diagram

Burner tube

Part #183450-003

Replaced by #100109255

?
Manufacturer substitution
This part replaces 183450-003. Substitute parts can look different from the original.
$70.00
In Stock
Insulation 181639-003
#NI

Water heater diagram

Insulation

Part #181639-003

Replaced by #9003971005

?
Manufacturer substitution
This part replaces 181639-003. Substitute parts can look different from the original.
$21.99
In Stock
Drain Pan 23913-A
#26A

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

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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