AO Smith
Gas Water Heater

Model #GPSH40100 Official AO Smith water heater

Here are the diagrams and repair parts for AO Smith GPSH40100 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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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

Showing 10 of 45 parts

Water Heater Temperature and Pressure Relief Valve (replaces 6900816, 9000071)#43

Water heater Diagram

Valve

Part #76527-3
Replaced by #9000071015
?
Manufacturer substitution
This part replaces 76527-3. Substitute parts can look different from the original.
BEST SELLER
In Stock
$15.54 | 
11% OFF 
Phone Price: $17.54
Water Heater Burner Igniter#17

Water heater Diagram

Igniter assembly

Part #184047
Replaced by #9003626005
?
Manufacturer substitution
This part replaces 184047. Substitute parts can look different from the original.
In Stock
$139.93
Access Parts#23

Water heater Diagram

Access parts

Part #183509-002
In Stock
$54.49
Restrictor#28

Water heater Diagram

Restrictor

Part #184501-000
This item is not returnable
In Stock
$2.16
Restrictor#29

Water heater Diagram

Restrictor

Part #184502-000
In Stock
$10.99
Water Heater Owner's Manual#NI

Water heater Diagram

In Stock
$8.49
Burner Tube#19

Water heater Diagram

Burner tube

Part #184051
Replaced by #184051-000
?
Manufacturer substitution
This part replaces 184051. Substitute parts can look different from the original.
In Stock
$20.99
Label#NI

Water heater Diagram

Label

Part #182734
Replaced by #182734-000
?
Manufacturer substitution
This part replaces 182734. Substitute parts can look different from the original.
In Stock
$13.99
Inlet Tube#40

Water heater Diagram

Inlet tube

Part #183359-41
Replaced by #183359-041
?
Manufacturer substitution
This part replaces 183359-41. Substitute parts can look different from the original.
This item is not returnable
In Stock
$6.49
Limit Switch#7

Water heater Diagram

Limit switch

Part #183380-2
Replaced by #9004661115
?
Manufacturer substitution
This part replaces 183380-2. Substitute parts can look different from the original.
In Stock
$105.49

Symptoms common to all water heaters

Choose a symptom to see related water heater repairs.

Main causes: thermostat temperature set too high, thermostats need adjustment, faulty thermostat, shorted heating element
Main causes: faulty pressure relief valve, water is overheating
Main causes: broken heating element, thermostat failure, excessive tank sediment, tank size too small, burner valve assembly failure
Main causes: lack of power, no gas supply, thermostat limit switch tripped, bad element, bad thermostat, gas valve failure, bad thermocouple
Main causes: water supply needs chlorine treatment, anode rod too reactive
Main causes: thermostats need adjustment, water heater capacity too low, bad heating element, thermostat failure, excessive tank sediment
Main causes: loose water pipe fittings, leaky drain valve, bad temperature-pressure relief valve, leaky heating element, cracked tank

Articles and videos common to all water heaters

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

October 24, 2022

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Easy DIY appliance repairs that anyone can do

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Cleaning your appliances after a drinking water advisory

Cleaning your appliances after a drinking water advisory

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August 1, 2015

Easy DIY water heater repairs

Easy DIY water heater repairs

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