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Reliance
Electric Water Heater

Model # 640SHMS Official Reliance water heater

Here are the diagrams and repair parts for Official Reliance 640SHMS water heater, as well as links to manuals and error code tables, if available.

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Error Codes

Model diagram and schematic

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ALL PARTS
Showing 10 of 19 parts  |
2-way 042286-022
#5

Water heater diagram

2-way

Part #042286-022

Replaced by #9000095015

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Manufacturer substitution
This part replaces 042286-022. Substitute parts can look different from the original.
BEST SELLER
$31.32 | 
16% OFF Phone Price : $37.32
In Stock
Anode Rod 183523-023
#8

Water heater diagram

Anode rod

Part #183523-023

Replaced by #100109624

?
Manufacturer substitution
This part replaces 183523-023. Substitute parts can look different from the original.
$31.11
In Stock
Access Panel 181260-000
#1

Water heater diagram

Access panel

Part #181260-000

Replaced by #100109599

?
Manufacturer substitution
This part replaces 181260-000. Substitute parts can look different from the original.
$30.00
In Stock
Drain Valve 042037-004
#3

Water heater diagram

Drain valve

Part #042037-004

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

Relief Valve 043151-000
#9

Water heater diagram

Relief valve

Part #043151-000

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

Insulation Kit 183256-000
#13

Water heater diagram

Insulation kit

Part #183256-000

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

Insulation 181639-003
#14

Water heater diagram

Insulation

Part #181639-003

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

Cover W/h.limit 183530-000
#10

Water heater diagram

Cover w/h.limit

Part #183530-000

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

J.box Covr 184860-000
#16

Water heater diagram

J.box covr

Part #184860-000

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

Element Gasket 0005300370
#6

Water heater diagram

Element gasket

Part #0005300370

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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