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State
Electric Water Heater

Model # ES66SOMS Official State water heater

Here are the diagrams and repair parts for Official State ES66SOMS 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 14 parts  |
Water Heater Heating Element Gasket 9000308
#6

Water heater diagram

Water heater heating element gasket

Part #9000308

Replaced by #9000308005

?
Manufacturer substitution
This part replaces 9000308. Substitute parts can look different from the original.
$30.62
| 
16% OFF Phone Price : $36.62
In Stock
2-way 9003976
#7

Water heater diagram

2-way

Part #9003976

Replaced by #9003976015

?
Manufacturer substitution
This part replaces 9003976. Substitute parts can look different from the original.
$15.49
In Stock
2-way 9004330
#5

Water heater diagram

2-way

Part #9004330

Replaced by #100263839

?
Manufacturer substitution
This part replaces 9004330. Substitute parts can look different from the original.
$34.44
In Stock
Element 9002072
#1

Water heater diagram

Element

Part #9002072

Replaced by #100108358

?
Manufacturer substitution
This part replaces 9002072. Substitute parts can look different from the original.
$31.11
In Stock
Anode Rod 9003942
#3

Water heater diagram

Anode rod

Part #9003942

Replaced by #100109623

?
Manufacturer substitution
This part replaces 9003942. Substitute parts can look different from the original.
$61.11
In Stock
Box Cover 9001327
#13

Water heater diagram

Box cover

Part #9001327

Replaced by #100108548

?
Manufacturer substitution
This part replaces 9001327. Substitute parts can look different from the original.
$26.67
In Stock
Thermostat 9000509
#12

Water heater diagram

Thermostat

Part #9000509

Replaced by #100108424

?
Manufacturer substitution
This part replaces 9000509. Substitute parts can look different from the original.
$30.00
In Stock
2-way 9003955
#1A

Water heater diagram

2-way

Part #9003955

Replaced by #9003955115

?
Manufacturer substitution
This part replaces 9003955. Substitute parts can look different from the original.
$36.99
In Stock
2-way 9002853
#10

Water heater diagram

2-way

Part #9002853

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

2-way 9006297
#4

Water heater diagram

2-way

Part #9006297

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

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 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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Repair guides for electric water heaters

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How to replace a water heater element

How to replace a water heater element

If your water heater runs out of hot water quickly and one of the two heating elements has failed, replace the element f...

Read more
Repair difficulty
Time required
30 minutes or less
How to replace an electric water heater anode rod

How to replace an electric water heater anode rod

If your hot water begins to smell like rotten eggs, replace the anode rod with a zinc-aluminum anode rod following the i...

Read more
Repair difficulty
Time required
15 minutes or less
How to replace an electric water heater thermostat

How to replace an electric water heater thermostat

If the water temperature fluctuates or you don't get enough hot water, follow these instructions to replace your water h...

Read more
Repair difficulty
Time required
30 minutes or less

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

How to read a wiring schematic video

Learn how to decipher symbols so you can buy the right part for your problem....

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Easy DIY water heater repairs

Easy DIY water heater repairs

Read about some water heater repairs that you can easily do yourself....

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Water heater common questions

Water heater common questions

These common questions and answers can help you make the most of your water heater....

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