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Reliance
Gas Water Heater

Model # 640HBDS Official Reliance water heater

Here are the diagrams and repair parts for Official Reliance 640HBDS 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 14 parts  |
Anode Mg 9003938005
#8A

Water heater diagram

Anode mg

Part #9003938005

$52.49
In Stock
Vent Assembly 9006538005
#5

Water heater diagram

Vent assembly

Part #9006538005

$452.49
In Stock
Water Heater Anode Rod (replaces 9003920) 9006299005
#8B

Water heater diagram

Water heater anode rod (replaces 9003920)

Part #9006299005

Replaced by #100111073

?
Manufacturer substitution
This part replaces 9006299005. Substitute parts can look different from the original.
$44.44
In Stock
Drain Valve 9003906015
#4

Water heater diagram

Drain valve

Part #9003906015

Replaced by #9009086015

?
Manufacturer substitution
This part replaces 9003906015. Substitute parts can look different from the original.
$19.49
In Stock
Water Heater Magnesium Anode Rod 9001829005
#8

Water heater diagram

Water heater magnesium anode rod

Part #9001829005

Replaced by #100108660

?
Manufacturer substitution
This part replaces 9001829005. Substitute parts can look different from the original.
$60.00
In Stock
Gas Valve 9006537005
#3

Water heater diagram

Gas valve

Part #9006537005

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

Dip Tube 9006532005
#9

Water heater diagram

Dip tube

Part #9006532005

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

Cover 9006627005
#11

Water heater diagram

Cover

Part #9006627005

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

Vent Pipe 9006539005
#6

Water heater diagram

Vent pipe

Part #9006539005

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

Heat Trap 9003915015
#10

Water heater diagram

Heat trap

Part #9003915015

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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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

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Water heater common questions

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